![980-71-2,Brompheniramine hydrogen maleate,Brompheniramine maleate;Pyridine, 2-(p-bromo-alpha-(2-(dimethylamino)ethyl)benzyl)-, maleate (1:1);gamma-(4-Bromophenyl)-N,N-dimethyl-2-pyridinepropanamine;Dimetane Extentabs;Parabromdylamine maleate;2-(p-Bromo-alpha-(2-(dimethylamino)ethyl)benzyl)pyridine maleate;Dimetapp Elixir;Veltane;Ebalin;Spentane;Lodrane Liquid;Dristan Allergy;2-(p-Bromo-alpha-(2-(dimethylamino)ethyl)benzyl)pyridine maleate (1:1);Drixoral Syrup;Dimetane;Brompheniramine maleate (USP);Gammistin;Dimotane;2-Pyridinepropanamine, gamma-(4-bromophenyl)-N,N-dimethyl-, (2Z)-2-butenedioate (1:1);Brompheniraminum [INN-Latin];Dimetapp allergy;Rolabromophen;Prestwick_913;Dimetapp DM;2-Pyridinepropanamine, gamma-(4-bromophenyl)-N,N-dimethyl-, (+-)-, (Z)-2-butenedioate (1:1);Drauxin;Allent;Dimetapp Childrens Chewable;Bromopheniramine maleate;Dimetapp Tablets;Dimetapp allergy (TN);2-Pyridinepropanamine, gamma-(4-bromophenyl)-N,N-dimethyl-, (Z)-butenedioate (1:1);2-Pyridinepropanamine,?-(4-bromophenyl)-N,- N-dimethyl-,(2Z)-2-butenedioate (1:1);](http://file1.lookchem.com/cas/reactions/2021/07/30/4117058.png)
Brompheniramine hydrogen maleate(980-71-2)
- CAS Registry Number:
- 980-71-2
- Synonyms:
- Brompheniramine maleate;Pyridine, 2-(p-bromo-alpha-(2-(dimethylamino)ethyl)benzyl)-, maleate (1:1);gamma-(4-Bromophenyl)-N,N-dimethyl-2-pyridinepropanamine;Dimetane Extentabs;Parabromdylamine maleate;2-(p-Bromo-alpha-(2-(dimethylamino)ethyl)benzyl)pyridine maleate;Dimetapp Elixir;Veltane;Ebalin;Spentane;Lodrane Liquid;Dristan Allergy;2-(p-Bromo-alpha-(2-(dimethylamino)ethyl)benzyl)pyridine maleate (1:1);Drixoral Syrup;Dimetane;Brompheniramine maleate (USP);Gammistin;Dimotane;2-Pyridinepropanamine, gamma-(4-bromophenyl)-N,N-dimethyl-, (2Z)-2-butenedioate (1:1);Brompheniraminum [INN-Latin];Dimetapp allergy;Rolabromophen;Prestwick_913;Dimetapp DM;2-Pyridinepropanamine, gamma-(4-bromophenyl)-N,N-dimethyl-, (+-)-, (Z)-2-butenedioate (1:1);Drauxin;Allent;Dimetapp Childrens Chewable;Bromopheniramine maleate;Dimetapp Tablets;Dimetapp allergy (TN);2-Pyridinepropanamine, gamma-(4-bromophenyl)-N,N-dimethyl-, (Z)-butenedioate (1:1);2-Pyridinepropanamine,?-(4-bromophenyl)-N,- N-dimethyl-,(2Z)-2-butenedioate (1:1);
- Molecular Formula:
- C16H19BrN2·C4H4O4
- Molecular Weight:
- 435.318
- EINECS:
- 213-562-9
CAS No.:980-71-2
Name: Brompheniramine hydrogen maleate
Related Suppliers
CAS No.980-71-2 Brompheniramine hydrogen maleate Manufacturer/High quality/Best price/In stock
Assay:98% Appearance:detailed see specifications Package:according to the clients requirement Storage:Store in dry, dark and ventilated place. Transportation:by sea or by air Application:It is an important raw material and intermediate used in Organic Synthesis, Pharmaceuticals, Agrochemicals and Dyestuff.
Min. Order:1Kilogram
Supplier:Dayang Chem (Hangzhou) Co.,Ltd. [
China (Mainland)]
CAS No.980-71-2 NewblueCHEM--980-71-2---Brompheniramine hydrogen maleate
Assay:99% Appearance:White powder Package:normal package Storage:room tempurature Transportation:BY SEA Application:medical
Min. Order:1Metric Ton
Supplier:HENAN NEW BLUE CHEMICAL CO.,LTD [
China (Mainland)]
CAS No.980-71-2 Brompheniramine hydrogen maleate
Assay:99% Appearance:neat Package:according to the need of packing Storage:Refrigerator Transportation:air sea or courier Application:intermediate
Min. Order:1Gram
Supplier:Shanghai Minstar Chemical Co., Ltd [
China (Mainland)]
CAS No.980-71-2 Brompheniramine hydrogen maleate
Assay:99% Package:According to customer requirements Transportation:By Sea/Air/Courier Application:medicine
Min. Order:10Gram
Supplier:Zibo Hangyu Biotechnology Development Co., Ltd [
China (Mainland)]
CAS No.980-71-2 Brompheniramine hydrogen maleate
Assay:99% Package:According client's requirements Transportation:by sea/by air/by courier Application:Chemical products
Min. Order:1Kilogram
Supplier:Hangzhou ZeErRui Chemical Co., Ltd. [
China (Mainland)]
CAS No.980-71-2 Brompheniramine hydrogen maleate 980-71-2
Assay:99% Appearance:White Powder Package:According yo your request Storage:Inert atmosphere,Room Temperature Transportation:We will pack and ship according to your requirements Application:The pharmaceutical industry; Food additives; Catalyst; Agrochemical industry; Organic chemicals; Inorganic chemical
Min. Order:1Kilogram
Supplier:Hebei Nengqian Chemical Import and Export Co., LTD [
China (Mainland)]
CAS No.980-71-2 Brompheniramine hydrogen maleate
Assay:99% Appearance:powder Package:Ex-factory package Storage:Keep in dark place,Sealed in dry,Room Temperature Transportation:1.Stock products are normally shipping within 3 working days. 2.For rush delivery, please contact our sales team for particular arrangement. Shipping Details: 1.We ship goods via DHL, Application:Pharmaceutical raw materials
Min. Order:1Gram
Supplier:HEBEI SHENGSUAN CHEMICAL INDUSTRY CO.,LTD [
China (Mainland)]
CAS No.980-71-2 brompheniramine maleate
Assay:99.0% Appearance:liquid Package:Grams, Kilograms Storage:Store the container tightly closed in a dry, cool and well-ventilated place. Store apart from foodstuff containers or incompatible materials. Transportation:According to customer request Application:For R&D and commerical use
Min. Order:100Gram
Supplier:Chemlyte Solutions [
China (Mainland)]
CAS No.980-71-2 Brompheniramine hydrogen maleate factory price
Assay:99% Appearance:White to Off-White neat Package:25kg/drum Storage:room temperature Transportation:Express/Sea/Air Application:This drug is only available in combination with other medications: Bromfed, Dimetane, Dimetapp, Drixomed, Histatab, Nasahist. The only difference between this agent and chlorpheniramine is the substit
Min. Order:1Kilogram
Supplier:Hangzhou Sartort Biopharma Co., Ltd [
China (Mainland)]
CAS No.980-71-2 buy-Brompheniramine hydrogen maleate
Assay:99%min Appearance:white to off white powder Package:According to regular packing:bottle,Foil Bag ,Tin , drum etc Storage:Shall be stored it in a dry and cool area. Transportation:ocean shipping or air transportation Application:Pharmaceutical active ingredients Pharmaceutical intermediates etc
Min. Order:1Kilogram
Supplier:Afine Chemicals Limited [
China (Mainland)]
CAS No.980-71-2 Brompheniramine hydrogen maleate Powder USP Standard
Assay:0.99 Appearance:White fine powder Package:according to the clients requirement Storage:Store in dry dark and ventilated place Transportation:Transportation by express, air, sea; port mainly to Qingdao / Tianjin / Shanghai, or according to customer needs to send different ports and aviation. Application:It is an important raw material.
Min. Order:1Kilogram
Supplier:Shandong Hanjiang Chemical Co., Ltd. [
China (Mainland)]
CAS No.980-71-2 980-71-2 supplier in China
Assay:99% Appearance:white crystalline powder Package:100g/bottle,1kg/bottle,25kg/drum or as per your request Storage:Sealed in a cool ,dry and microtherm place , avoid light . Transportation:By express, air transportation or by sea transportation. Application:It is an important raw material and medical intermediate of synthetic drugs.
Min. Order:100Gram
Supplier:HANGZHOU YUNUO CHEMICAL CO.,LTD [
China (Mainland)]
CAS No.980-71-2 Brompheniramine hydrogen maleate
Assay:99.90% Appearance:solid or liquid Package:drum and bag Storage:in sealed air resistant place Transportation:by sea or air Application:for pharma use
Min. Order:0
Supplier:Kono Chem Co.,Ltd [
China (Mainland)]
CAS No.980-71-2 Bromopheniramine maleate
Assay:99% Appearance:White powder Package:200/Kilograms Storage:Sealed and preserved Transportation:By sea Application:Fine chemical intermediates, used as the main raw material for the synthesis of various pesticides, medicines, surfactants, polymer monomers, and antifungal agents
Min. Order:0
Supplier:GIHI CHEMICALS CO.,LIMITED [
China (Mainland)]
CAS No.980-71-2 Brompheniramine hydrogen maleate
Assay:99% Package:25kg/Drum Storage:100tons Transportation:By air/By sea Application:Chemical industry
Min. Order:0
Supplier:Hebei Mujin Biotechnology Co.,Ltd [
China (Mainland)]
CAS No.980-71-2 Brompheniramine Maleate
Assay:NLT 98% Appearance:White powder Package:Aluminum bag Storage:Room temperature Transportation:By air Application:Used in producing API
Min. Order:0
Supplier:Hangzhou Huarong Pharm Co., Ltd. [
China (Mainland)]
CAS No.980-71-2 Brompheniramine hydrogen maleate
Assay:99% Application:Medical research field
Min. Order:0
Supplier:Qingdao Beluga Import and Export Co., LTD [
China (Mainland)]
CAS No.980-71-2 CAS:980-71-2 C20H23BrN2O4 Brompheniramine hydrogen maleate
Assay:99% Appearance:white poweder Package:Plastic vacuum packaging bag or bucket Storage:under the cool and dry area Transportation:by express or by sea Application:CAS:980-71-2 C20H23BrN2O4
Min. Order:500Gram
Supplier:HENAN SUNLAKE ENTERPRISE CORPORATION [
China (Mainland)]
CAS No.980-71-2 Brompheniramine hydrogen maleate
Assay:98%min Appearance:Off-white to light yellow powder Package:According to the clients requirement. Storage:Keep in cool place. Transportation:Sea/air/courier Application:Pharmaceutical intermediates
Min. Order:0
Supplier:Hangzhou J&H Chemical Co., Ltd. [
China (Mainland)]
CAS No.980-71-2 Brompheniramine hydrogen maleate
Assay:99% Appearance:white powder Package:25kg,50kg,180kg,200kg,250kg,1000kg锛宑ustomization Storage:Keep it in dry,shady and cool place Transportation:by express or by sea Application:Pharma;Industry;Agricultural;chemical reaserch
Min. Order:0
Supplier:Wuhan Circle Star Chem-medical Technology co.,Ltd. [
China (Mainland)]
CAS No.980-71-2 Brompheniramine hydrogen maleate
Assay:99% Package:box or opp package Storage:cool drum Transportation:air or sea Application:Brompheniramine hydrogen maleate
Min. Order:1Milligram
Supplier:weifang yangxu group co.,ltd [
China (Mainland)]
CAS No.980-71-2 Brompheniramine hydrogen maleate
Assay:99% Package:drum Transportation:By Sea/Air/DHL Application:chemical
Min. Order:0
Supplier:Henan Wentao Chemical Product Co., Ltd. [
China (Mainland)]
CAS No.980-71-2 Brompheniramine hydrogen maleate
Assay:99%min
Min. Order:1Gram
Supplier:Nanjing Finetech Chemical Co., Ltd. [
China (Mainland)]
CAS No.980-71-2 (S)-Brompheniramine Maleate
Assay:95%+ or 98%+ Application:for drug impurity for drug standards,for drug research and development銆侱rug impurity reference, drug standard, analytical chemistry, standard substance, organic chemical synthesis, chemical custo...
Min. Order:25Milligram
Supplier:Hubei Moxin Biotechnology Co., Ltd [
China (Mainland)]
CAS No.980-71-2 Brompheniramine hydrogen maleate
Assay:99 Appearance:powder, or liquid Package:Bottle, barrel, cargo, container, etc. Storage:Stored in room temperature, ventilated place Transportation:By air, ship, express, etc. Application:Pharmaceuticals, intermediates, APIs, custom synthesis, chemicals
Min. Order:0
Supplier:LEAP CHEM Co., Ltd. [
China (Mainland)]
CAS No.980-71-2 Brompheniramine hydrogen maleate
Assay:99 Appearance:off white Package:drum Storage:Dry,cool place Transportation:by air/sea/express Application:active pharmaceutical ingredients
Min. Order:0
Supplier:Hubei Vanz Pharm Co.,Ltd [
China (Mainland)]
CAS No.980-71-2 Brompheniramine hydrogen maleate
Assay:99% Package:1kg/bag; 1941kg/drum, or as customer's request. Transportation:DHL, EMS, FedEx, TNT, AIR, SEA Application:Xiamen Luyunjia Trading Co.,Ltd
Min. Order:0
Supplier:Luyunjia Chemistry Xiamen Limited [
China (Mainland)]
CAS No.980-71-2 Brompheniramine hydrogen maleate
Assay:99%min Appearance:White powder Package:drum Storage:Store in cool and dry place, away from sun light. Transportation:By sea or by air Application:Antihistaminic
Min. Order:1Kilogram
Supplier:Henan Sinotech Import&Export Corporation [
China (Mainland)]
CAS No.980-71-2 Pharmaceutical Grade CAS 980-71-2 with competitive price
Assay:99% Appearance:White powder Package: [Packaging]20mg, 50mg,100mg,1g,10g,100g,according to customers' requirements Storage: should be stored in a well-closed container at low temperature, keep away from moisture, heat and light. Transportation:1. Samples 1kg-10kg are shipped by international express. 2. 50kg-100kg of goods are transported by dedicated line logistics. 3. Cargo 100kg-1ton is transported by dedicated line logistics. Application:Raw materials in the pharmaceutical field
Min. Order:10Kilogram
Supplier:Zhuozhou Wenxi import and Export Co., Ltd [
China (Mainland)]
CAS No.980-71-2 Chlorpheniramine maleate /CAS锛?80-71-2 /with best price
Assay:99% Appearance:See the real Package:100g/bag 1kg/bag 25kg/barrels Storage:Warehouse ventilation low temperature drying; Separate from food ingredients Transportation:Air freight; shipping锛汥HL;FEDEX;TNT... Application:Medical, scientific research, export
Min. Order:25Kilogram
Supplier:Hubei DiBo chemical co., LTD [
China (Mainland)]
CAS No.980-71-2 Brompheniramine maleate
Assay:97% Appearance:Powder or liquid Package:According to customer Storage:Store in a tightly closed container, in a cool and dry place. Transportation:Fedex,DHL,TNT,BY SEA and BY AIR Application:Medicinal Chemistry Biomedicine Pharmaceutical intermediates Chemistry experiment Biological experiments Chemical reagent For R&D use only.
Min. Order:10Milligram
Supplier:Amadis Chemical Co., Ltd. [
China (Mainland)]
CAS No.980-71-2 Brompheniramine hydrogen maleate
Assay:95-99% Package:10g,100g, 1kg,According to customer Storage:dry and cool Transportation:By air or by courier Application:Chemical raw materials, pharmaceutical intermediates, cosmetic raw materials, etc.
Min. Order:10Gram
Supplier:TaiChem Taizhou Limited [
China (Mainland)]
CAS No.980-71-2 brompheniramine maleate
Assay:98% Appearance:solid or liquid Package:According to customer鈥榮 requirement Storage:Keep in a cool & dry place Transportation:by sea or air Application:APIs
Min. Order:0
Supplier:Xiamen AmoyChem Co.,Ltd [
China (Mainland)]
CAS No.980-71-2 Brompheniramine maleate
Assay:97% Appearance:white powder Package:according to the clients requirement Storage:Room temperature with sealed well Transportation:by sea or by air Application:Use as primary and secondary intermediate
Min. Order:0
Supplier:BOC Sciences [
United States]
CAS No.980-71-2 Brompheniramine maleate 980-71-2
Assay:96% Appearance:solid or liquid Package:Foil bag; Drum; Plastic bottle Storage:in sealed air resistant place Transportation:by sea or air Application:Pharma;Industry;Agricultural
Min. Order:0
Supplier:Hunan Russell Chemicals Technology Co.,Ltd [
China (Mainland)]
CAS No.980-71-2 Brompheniramine hydrogen maleate manufacturer
Assay:鈮?8% Appearance:White powder Package:According client's requirements Storage:keep sealed and keep from direct light Transportation:by express or by sea Application:pharmaceutical
Min. Order:0
Supplier:Shanghai Yuanye Bio-Technology Co., Ltd. [
China (Mainland)]
CAS No.980-71-2 Brompheniramine maleate
Appearance:95%+ Package:R&D,Pilot run Transportation:per client require
Min. Order:0
Supplier:Hunan chemfish Pharmaceutical co.,Ltd [
China (Mainland)]
CAS No.980-71-2 Brompheniramine hydrogen maleate
Assay:99% Application:It is an important raw material.
Min. Order:0
Supplier:Shandong Mopai Biotechnology Co., LTD [
China (Mainland)]
CAS No.980-71-2 Brompheniramine Maleate (125 mg)
Assay:98% Package:According to the demand of customer Storage:Sealed, dry, microtherm , avoid light and smell. Transportation:by air or by sea Application:Organic synthesis
Min. Order:0
Supplier:Henan Allgreen Chemical Co.,Ltd [
China (Mainland)]
- Hangzhou Huarong Pharm Co., Ltd.
China (Mainland)
- Tel:+86-571-86758373
- Room1101, Hakim International Building, Gongshu District, Hangzhou, Zhejiang Province, China.
- Dayang Chem (Hangzhou) Co.,Ltd.
China (Mainland)
- Tel:+86-571-88938639
- 9/F, Unit 2 Changdi Torch Building, 259# WenSan Road, Xihu District, Hangzhou City 310012, P.R.China
- weifang yangxu group co.,ltd
China (Mainland)
- Tel:+08613666361637--
- No 5.dongfeng east street.gaoxin district.weifang city.
- Hubei Moxin Biotechnology Co., Ltd
China (Mainland)
- Tel:+86-173-20513646
- Company address: Room 005, 15th Floor, Building D2, Phase III, Software New Town, No. 8 Huacheng Avenue, East Lake High-tech Development Zone, Wuhan, Hubei Province, China
- Wuhan Circle Star Chem-medical Technology co.,Ltd.
China (Mainland)
- Tel:13437180835
- Room 02-31, 13 / F, Building 9, Guannan Fuxing Medical Park Phase II, No.58, Guanggu Avenue, East Lake New Technology Development Zone, Wuhan, Hubei, China (Wuhan Area, Free Trade Zone)
- Shandong Mopai Biotechnology Co., LTD
China (Mainland)
- Tel:+86-15965530500
- shandong
- TaiChem Taizhou Limited
China (Mainland)
- Tel:+86-0523-86810091
- Changjiang Dadao 18
- HEBEI SHENGSUAN CHEMICAL INDUSTRY CO.,LTD
China (Mainland)
- Tel:+8615383190639-15383190639-15383190639
- Hao Shun Hua Yue City
- Hebei Nengqian Chemical Import and Export Co., LTD
China (Mainland)
- Tel:86-139-10575315
- No.1722, Block C, Yangguang Xinzhuo Plaza, 256 Renmin West Road, Fuxing District, Handan City, Hebei Province
- Hebei Nengqian Chemical Import and Export Co., LTD
China (Mainland)
- Tel:86-139-10575315
- No.1722, Block C, Yangguang Xinzhuo Plaza, 256 Renmin West Road, Fuxing District, Handan City, Hebei Province
- LEAP CHEM Co., Ltd.
China (Mainland)
- Tel:+852-30606658
- EASEY COMM BLDG 253-261 HENNESSY ROAD Hong Kong, China
- Qingdao Beluga Import and Export Co., LTD
China (Mainland)
- Tel:+8613854236000
- qingdao
- Nanjing Finetech Chemical Co., Ltd.
China (Mainland)
- Tel:0086-25-52078417
- No.9 Weidi Road Jiangsu Life-science High-tech Zone, 210046, Nanjing China.
- Shandong Hanjiang Chemical Co., Ltd.
China (Mainland)
- Tel:+86 18369939125
- No.25A Qilu Industrial Park
- Shandong Hanjiang Chemical Co., Ltd.
China (Mainland)
- Tel:+86 18369939125
- No.25A Qilu Industrial Park
- Zhuozhou Wenxi import and Export Co., Ltd
China (Mainland)
- Tel:+86-13111626072
- Room 1710, Baoxin International Phase I, 19 Guanyun East Road, Zhuozhou, Hebei
- Zhuozhou Wenxi import and Export Co., Ltd
China (Mainland)
- Tel:+86-13111626072
- Room 1710, Baoxin International Phase I, 19 Guanyun East Road, Zhuozhou, Hebei
- Zhuozhou Wenxi import and Export Co., Ltd
China (Mainland)
- Tel:+86-13111626072
- Room 1710, Baoxin International Phase I, 19 Guanyun East Road, Zhuozhou, Hebei
- Zhuozhou Wenxi import and Export Co., Ltd
China (Mainland)
- Tel:+86-13111626072
- Room 1710, Baoxin International Phase I, 19 Guanyun East Road, Zhuozhou, Hebei
- Zhuozhou Wenxi import and Export Co., Ltd
China (Mainland)
- Tel:+86-13111626072
- Room 1710, Baoxin International Phase I, 19 Guanyun East Road, Zhuozhou, Hebei
- Chemlyte Solutions
China (Mainland)
- Tel:+86-189 8945 5137
- Jian Qiao Community, 789 Shenhua Road, Xihu District, Hangzhou, China, 310000
- Chemlyte Solutions
China (Mainland)
- Tel:+86-189 8945 5137
- Jian Qiao Community, 789 Shenhua Road, Xihu District, Hangzhou, China, 310000
- Hebei Mujin Biotechnology Co.,Ltd
China (Mainland)
- Tel:13231137666
- hebei province,China
- Henan Wentao Chemical Product Co., Ltd.
China (Mainland)
- Tel:+86-370-2722992
- 32 Room, 5th Floor, Building 11, No. 6 Yinxing Road, High-tech Industrial Development Zone, Zhengzhou City, Henan Province
- Xiamen AmoyChem Co.,Ltd
China (Mainland)
- Tel:+86 592 605 1114
- Factory 2/F, NO. 206 Weili Road
- Hubei DiBo chemical co., LTD
China (Mainland)
- Tel:+86 15871366807
- No. 782 of wuchang district of wuhan city, hubei province
- Hangzhou ZeErRui Chemical Co., Ltd.
China (Mainland)
- Tel:+86-571-82512721
- No 317,Jingling Road,Guali Town,Xiaoshan District
- Hunan Russell Chemicals Technology Co.,Ltd
China (Mainland)
- Tel:0086-182-2994-0868
- Buiding4,Lugu Enterprise Plaza, Yuelu Distric
- Hunan chemfish Pharmaceutical co.,Ltd
China (Mainland)
- Tel:0731-85567275
- Innovation center , Meixi Lake ,Yuelu district ,Changsha City, Hunan Province , China
- Luyunjia Chemistry Xiamen Limited
China (Mainland)
- Tel:86-592-5360779
- Huli District, Xiamen, China
Other Product
- -
- -
- -
- -
- -
- -
- -
- -
- -
- (4S,6R)-6-{2-[(2-hydroxy-ethyl)-(4-methoxy-benzenesulfonyl)-amino]-ethoxy}-4-isopropyl-5,6-dihydro-4H-pyran-2-carboxylic acid allyl ester
- [1,4'-Bipiperidine]-1'-carboxylic acid, 4-(1H-indol-7-yl)-, ethyl ester
- 1,3,5-Tris(4-acetamidophenyl)penta-1,5-dione
- 1,5-Bis(3-aminophenyl)-3-(4-N,N-di-methylaminophenyl)penta-1,5-dione
- 1,5-Bis(4-acetamidophenyl)-3-phenylpenta-1,5-dione
- 1,5-Bis(4-aminophenyl)-3-(4-acetamido-phenyl)penta-1,5-dione
- 1,5-Bis(4-aminophenyl)-3-phenylpenta-1,5-dione