Ethyl 4,5-bis(2-methoxyethoxy)-2-nitrobenzoate(179688-26-7)
- CAS Registry Number:
- 179688-26-7
- Synonyms:
- 4,5-Bis(2-methoxyethoxy)-2-nitrobenzoic acid ethyl ester;
- Molecular Formula:
- C15H21NO8
- Molecular Weight:
- 343.334
- EINECS:
- 605-866-9
CAS No.:179688-26-7
Name: Ethyl 4,5-bis(2-methoxyethoxy)-2-nitrobenzoate
Related Suppliers
CAS No.179688-26-7 Ethyl 4,5-bis(2-methoxyethoxy)-2-nitrobenzoate 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.179688-26-7 Ethyl 4,5-bis(2-methoxyethoxy)-2-nitrobenzoate
Assay:99% Appearance:white powder Package:suitable for delivery Storage:closed and cool Transportation:by sea or air or courier Application:Erlotinib intermediate
Min. Order:1Gram
Supplier:Jinan Finer Chemical Co., Ltd [
China (Mainland)]
CAS No.179688-26-7 Ethyl 4,5-bis(2-methoxyethoxy)-2-nitrobenzoate,179688-26-7
Assay:99% Appearance:white powder Package:normal packing Storage:Room temperature. Transportation:by sea/by air Application:Pharmaceutical Intermediates, OLED Intermediates
Min. Order:1Kilogram
Supplier:HENAN NEW BLUE CHEMICAL CO.,LTD [
China (Mainland)]
CAS No.179688-26-7 Ethyl 4,5-bis(2-methoxyethoxy)-2-nitrobenzoate
Assay:99% Package:according to customer requirements Transportation:By Sea/Air/Courier Application:It is an important raw material.
Min. Order:10Gram
Supplier:Zibo Hangyu Biotechnology Development Co., Ltd [
China (Mainland)]
CAS No.179688-26-7 Ethyl 4,5-bis(2-methoxyethoxy)-2-nitrobenzoate
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.179688-26-7 Ethyl 4,5-bis(2-methoxyethoxy)-2-nitrobenzoate
Assay: 99% Appearance:powder Package:In plastic outside weave or according to your request Storage:Store at RT. Transportation:The product is a kind of white power which is safe, nontoxic and harmless. Keep from moisture during transport and should be stored in a cool, dry condition. Avoid breathing dust when handing, and was Application:4,5-di (2-methoxyethoxy) -2-nitrobenzoate ethyl ester is widely used in the fields of drug synthesis, pharmaceutical intermediates, and organic synthesis. It can be used as an important raw material f
Min. Order:1Kilogram
Supplier:Hebei Nengqian Chemical Import and Export Co., LTD [
China (Mainland)]
CAS No.179688-26-7 High quality Ethyl4,5-Bis(2-Methoxyethoxy)-2-Nitrobenzoate supplier in China
Assay:99% Appearance:white-off powder or granule ( referto COA) Package:25kgs/fiber drum Storage:Keep in a cool & dry place Transportation:by sea or by air Application:Pharma intermediate
Min. Order:0Metric Ton
Supplier:Simagchem Corporation [
China (Mainland)]
CAS No.179688-26-7 Ethyl 4,5-bis(2-methoxyethoxy)-2-nitrobenzoate
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:Organic chemicals
Min. Order:1Gram
Supplier:HEBEI SHENGSUAN CHEMICAL INDUSTRY CO.,LTD [
China (Mainland)]
CAS No.179688-26-7 Ethyl 4,5-bis(2-methoxyethoxy)-2-nitrobenzoate
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.179688-26-7 High Purity Ethyl4,5-Bis(2-Methoxyethoxy)-2-Nitrobenzoate 179688-26-7
Assay:99.5% Appearance:white or almost white crystalline powder Package:Pack & Store:25kg cardboard barrels lined with plastic bags; or otherwise customized Storage:In cool ,dry place Transportation:Preservce in well-closed containers, prptected from light, Application:USP34 Or EP STANDERUsed as Antibiotic and Antimicrobial Agents
Min. Order:100Kilogram
Supplier:Lonwin Chemical Group Limited [
China (Mainland)]
CAS No.179688-26-7 4,5-Bis(2-Methoxyethoxy)-2-nitrobenzoic acid ethyl ester
Assay:0.98 Appearance:Off white to slight yellow solid Package:1L 5L 10L 25L bottle Storage:Stored in shaded, cool and dry places Transportation:Handle with cares to avoid damaging the packages. Protect them from sunshine or rain. We can send by Fedex, by ship or by plane according to international rules. Application:pharma intermediate
Min. Order:0
Supplier:Antimex Chemical Limied [
China (Mainland)]
CAS No.179688-26-7 ETHYL 4,5-BIS(2-METHOXYETHOXY)-2-NITROBENZOATE
Assay:99% 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:An important raw material and intermediate used in Organic Synthesis, Pharmaceuticals
Min. Order:1Gram
Supplier:Afine Chemicals Limited [
China (Mainland)]
CAS No.179688-26-7 Ethyl4,5-Bis(2-Methoxyethoxy)-2-Nitrobenzoate
Assay:0.99 Appearance:white powder Package:25kg/drum;200kg/drum Storage:Keep away of light锛宑ool place Transportation:Sea/air/courier Application:Pharma Intermediate
Min. Order:0
Supplier:ORCHID CHEMICAL SUPPLIES LTD [
China (Mainland)]
CAS No.179688-26-7 Ethyl 4,5-bis(2-methoxyethoxy)-2-nitrobenzoate
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.179688-26-7 Ethyl 4,5-bis(2-methoxyethoxy)-2-nitrobenzoate
Assay:98% Application:intermediate
Min. Order:0
Supplier:SAGECHEM LIMITED [
China (Mainland)]
CAS No.179688-26-7 Ethyl 4,5-bis(2-methoxyethoxy)-2-nitrobenzoate
Assay:98%min Package:25kg/drum,or as per customers'demand Transportation:air,sea,courier Application:API,or Intermediates,fine chemicals
Min. Order:0
Supplier:GIHI CHEMICALS CO.,LIMITED [
China (Mainland)]
CAS No.179688-26-7 Ethyl 4,5-bis(2-methoxyethoxy)-2-nitrobenzoate
Assay:98% Application:intermediate
Min. Order:0
Supplier:HANGZHOU TIANYE CHEMICALS CO., LTD. [
China (Mainland)]
CAS No.179688-26-7 179688-26-7 C15H21NO8 Ethyl 4,5-bis(2-methoxyethoxy)-2-nitrobenzoate
Assay:99% Appearance:As detailed Package:As required Storage:room temperature Transportation:By air/sea/express Application:179688-26-7
Min. Order:1Kilogram
Supplier:HENAN SUNLAKE ENTERPRISE CORPORATION [
China (Mainland)]
CAS No.179688-26-7 Ethyl 4,5-bis(2-methoxyethoxy)-2-nitrobenzoate
Assay:98%min Appearance:Off-white to light yellow powder Package:According to the clients requirement. Storage:Keep in cool place. Application:Pharmaceutical intermediates
Min. Order:0
Supplier:Hangzhou J&H Chemical Co., Ltd. [
China (Mainland)]
CAS No.179688-26-7 Erlotinib EP Impurity A
Assay:95%+ or 98%+ Appearance:solid Package:10mg/25mg/50mg/100mg/1000mg/5000mg Storage:short-term storage normal temperature. long-term storage 2-8 鈩?nbsp;Transportation:express and sea transport and air freight 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.179688-26-7 Ethyl 4,5-bis(2-methoxyethoxy)-2-nitrobenzoate
Assay:99% Package:box or opp package Storage:cool drum Transportation:air or sea Application:Ethyl 4,5-bis(2-methoxyethoxy)-2-nitrobenzoate
Min. Order:1Milligram
Supplier:weifang yangxu group co.,ltd [
China (Mainland)]
CAS No.179688-26-7 CAS NO.:179688-26-7
Assay:99% Appearance:white powder Package:drum Storage:Room temperature Transportation:By Sea/Air/DHL Application:Pharmaceutical intermediates
Min. Order:0
Supplier:Henan Wentao Chemical Product Co., Ltd. [
China (Mainland)]
CAS No.179688-26-7 Ethyl4,5-Bis(2-Methoxyethoxy)-2-Nitrobenzoate
Assay:99% Appearance:detailed see specifications Package:25kg/drum;200kg/drum Storage:Keep away of light,cool place Transportation:Sea/air/courier Application:Chemical synthesis
Min. Order:0
Supplier:Xiamen Hisunny Chemical Co.,Ltd [
China (Mainland)]
CAS No.179688-26-7 Erlotinib Impurity 24
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:Transit could be DHL,UPS,TNT,EMS,Fedex,and so on. For mass orders, it will be delivered by air or sea. For small order, please expect 3-7 days by UPS DHL EMS. For mass order, please allow 5-8 days... Application:Pharma;Industry;Agricultural;chemical reaserch
Min. Order:0
Supplier:Wuhan Circle Star Chem-medical Technology co.,Ltd. [
China (Mainland)]
CAS No.179688-26-7 Ethyl 4,5-bis(2-methoxyethoxy)-2-nitrobenzoate
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.179688-26-7 Benzoic acid,4,5-bis(2-methoxyethoxy)-2-nitro-, ethyl ester
Assay:99 Appearance:White to yellow 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.179688-26-7 Ethyl 4,5-bis(2-methoxyethoxy)-2-nitrobenzoate
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.179688-26-7 Ethyl4,5-Bis(2-Methoxyethoxy)-2-Nitrobenzoate
Assay:COA Appearance:COA Storage:in stock Application:MSDS/TDS
Min. Order:0
Supplier:Aecochem Corp. [
China (Mainland)]
CAS No.179688-26-7 factory directly supply CAS 179688-26-7 with best 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:Chemical raw materials, pharmaceutical intermediates, cosmetic raw materials, etc.
Min. Order:1Kilogram
Supplier:Zhuozhou Wenxi import and Export Co., Ltd [
China (Mainland)]
CAS No.179688-26-7 Factory Supply Ethyl 4,5-bis(2-methoxyethoxy)-2-nitrobenzoate
Assay:99.9% Appearance:Refer to COA Package:drum Storage:keep in cool and dry place Transportation:by sea or by air Application:Intermediates and materials
Min. Order:1
Supplier:Ality Chemical Corporation [
China (Mainland)]
CAS No.179688-26-7 Ethyl 4,5-bis(2-methoxyethoxy)-2-nitrobenzoate CAS锛?79688-26-7 Chinese manufacturers high-quality
Assay:99% Appearance:Off white to white crystalline powder Package:100g/bag 1kg/bag 25kg/barrels Storage:Sealed storage below 25 鈩?nbsp;Transportation:Air freight; shipping锛汥HL;FEDEX;TNT... Application:Erotinib intermediate
Min. Order:25Kilogram
Supplier:Hubei DiBo chemical co., LTD [
China (Mainland)]
CAS No.179688-26-7 high quality Erlotinib Intermediate cas 179688-26-7 with the factory price on hot selling!!
Assay:99% Appearance:white or off-white powder Package:100g/ bag, 2 kg/ bag, 25kg/ carton or as required Storage:Store in sealed containers at cool & dry place. Protect from light, moisture and pest infestation. Transportation:By DHL, TNT, FedEx, HKEMS, UPS, Etc Application: intermediate
Min. Order:100Gram
Supplier:Wuhan 90000 Lithium Industry and Trade Co., Ltd. [
China (Mainland)]
CAS No.179688-26-7 Ethyl 4,5-bis(2-methoxyethoxy)-2-nitrobenzoate
Assay:鈮?8% Appearance:Liquid Package:Glass bottle or drum Storage:2-8鈩?nbsp;Transportation:RT Application:IMPURTY
Min. Order:50Milligram
Supplier:Shenzhen Regent Biochemistry Tech Co., Ltd. [
Hong Kong,China]
CAS No.179688-26-7 4,5-bis(2-methoxyethoxy)-2-nitrobenzoic acid ethyl ester
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.179688-26-7 Ethyl 4,5-bis(2-methoxyethoxy)-2-nitrobenzoate
Assay:鈮?9.0% Appearance:light yellow solid Package:100g,500g,1kg,25kg Storage:refrigerate Transportation:shipping Application:100g,500g,1kg,25kg,CAS锛?79688-26-7锛?,5-Bis(2-methoxyethoxy)-2-nitrobenzoic acid ethyl ester;Ethyl 4,5-bis(2-methoxyethoxy)-2-nitrobenzoate;Methyl 4,5-bis(2-methoxyethoxy)-2-nitrobenzoate;Erlotinib i
Min. Order:100Gram
Supplier:SHANGHAI SYSTEAM BIOCHEM CO., LTD [
China (Mainland)]
CAS No.179688-26-7 Ethyl 4,5-bis(2-methoxyethoxy)-2-nitrobenzoate
Assay:98.5% Appearance:white/off-white or light yellow Package:aluminum bottle,glass bottle,PTFE bottle,cardboard drum Storage:Store in cool and dry place, keep away from strong light and heat. Transportation:by courier, by air, by sea Application:This product can be used in food/pharmaceutical/cosmetical industry
Min. Order:0
Supplier:Suzhou Health Chemicals Co., Ltd. [
China (Mainland)]
CAS No.179688-26-7 Ethyl 4,5-Bis(2-methoxyethoxy)-2-nitrobenzoate
Assay:> 95 % Appearance:White solid Application:Ethyl 4,5-Bis(2-methoxyethoxy)-2-nitrobenzoate is used in the syntheses of 4-(indol-3-yl)quinazolines as epidermal growth factor receptor tyrosine kinase inhibitors. It is also used to prepare Erl...
Min. Order:0
Supplier:BOC Sciences [
United States]
- 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
- Lonwin Chemical Group Limited
- China (Mainland)
- Tel:Tel: 86-21-59858395
- No#966,Huaxu Road,Shanghai 201702,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
- 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)
- Wuhan Circle Star Chem-medical Technology co.,Ltd.
- China (Mainland)
- Tel:+86-13437180835
- 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)
- HANGZHOU TIANYE CHEMICALS CO., LTD.
- China (Mainland)
- Tel:0571-85083592
- 1208# HuaCe Building-B,Wuchanggang Road,XIHU District,Hangzhou City,Zhejiang Province ,China
- 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
- LEAP CHEM Co., Ltd.
- China (Mainland)
- Tel:+852-30606658
- EASEY COMM BLDG 253-261 HENNESSY ROAD Hong Kong, China
- Ality Chemical Corporation
- China (Mainland)
- Tel:86-(0)592-8883942
- Fine chemical industry park, Nantong,Jiangsu
- 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
- 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
- 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
- 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
- Wuhan 90000 Lithium Industry and Trade Co., Ltd.
- China (Mainland)
- Tel:+86-027-83214688
- 666 Gaoxin Avenue, Donghu New Technology Development Zone, Wuhan City, Hubei Province, China
- Zibo Hangyu Biotechnology Development Co., Ltd
- China (Mainland)
- Tel:86-15965530500
- Room1701, Tianxing Building,Licheng district, jinan, Shandong, China
- HENAN SUNLAKE ENTERPRISE CORPORATION
- China (Mainland)
- Tel:+86-371- 86259723
- Mingmen International Center, NO.222 Dongming Road,Zhengzhou,Henan,China
- Shenzhen Regent Biochemistry Tech Co., Ltd.
Hong Kong,China- Tel:+86-755-85201366
- PINGSHAN DIS., BAOSHAN INDUSTRIAL AREA
- Aecochem Corp.
- China (Mainland)
- Tel:+86-592 599 8717-.
- No 611 Sishui Road,Huli
- ORCHID CHEMICAL SUPPLIES LTD
- China (Mainland)
- Tel:+86-571-85395792
- 607, North Zhongshan Road, Hangzhou 310000 China
- Jinan Finer Chemical Co., Ltd
- China (Mainland)
- Tel:+86-531-88989536
- New Material Industry Park, Jinan Ciyt, China
- SHANGHAI SYSTEAM BIOCHEM CO., LTD
- China (Mainland)
- Tel:86-021-58380978
- Building 87，Lane 669， Dong Jing Road Shanghai,P.R.China
- HENAN NEW BLUE CHEMICAL CO.,LTD
- China (Mainland)
- Tel:86-371-55170693/55170694
- Zhengzhou International Trade New Territory,Jinshui District,Zhengzhou ,China
- Afine Chemicals Limited
- China (Mainland)
- Tel:+86-571-85134551
- No. 206 Zhen Hua Road, Hangzhou 310030, Zhejiang, 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