Sodium 2,2,3,3-tetrafluoropropionate(22898-01-7)
- CAS Registry Number:
- 22898-01-7
- Synonyms:
- Propanoicacid, 2,2,3,3-tetrafluoro-, sodium salt (9CI);Propionic acid,2,2,3,3-tetrafluoro-, sodium salt (8CI);2,2,3,3-Tetrafluoropropionic acidsodium salt;Frenock;Orga 3045;Sodium 2,2,3,3-tetrafluoropropanoate;Sodium2,2,3,3-tetrafluoropropionate;Sodium tetrafluoropropionate;TFP;Taskforce;Tetrafluoropropionic acid sodium salt;Tetrapion;
- Molecular Formula:
- C3HF4NaO2
- Molecular Weight:
- 168.023
- EINECS:
- 245-311-4
CAS No.:22898-01-7
Name: Sodium 2,2,3,3-tetrafluoropropionate
Related Suppliers
CAS No.22898-01-7 Sodium 2,2,3,3-tetrafluoropropionate 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)]
Assessed
SupplierTel:+86-571-88938639
Address:9/F, Unit 2 Changdi Torch Building, 259# WenSan Road, Xihu District, Hangzhou City 310012, P.R.China
- Contact Suppliers
CAS No.22898-01-7 22898-01-7
Assay:99% Appearance:see COA Package:bag Storage:dry and cool place Transportation:by sea, air, courier Application:Organic Chemicals
Min. Order:1Kilogram
Supplier:HENAN NEW BLUE CHEMICAL CO.,LTD [ China (Mainland)]
Assessed
SupplierTel:86-371-55170693/55170694
Address:Zhengzhou International Trade New Territory,Jinshui District,Zhengzhou ,China
- Contact Suppliers
CAS No.22898-01-7 Sodium 2,2,3,3-tetrafluoropropionate
Assay:99% Appearance:powder or liquid Package:according to customer requirements Storage:store in dry dark and ventilated place Transportation:By Sea/Air/Courier Application:It is an important raw material.
Min. Order:10Gram
Supplier:Zibo Hangyu Biotechnology Development Co., Ltd [ China (Mainland)]
Assessed
SupplierTel:86-15965530500
Address:Room1701, Tianxing Building,Licheng district, jinan, Shandong, China
- Contact Suppliers
CAS No.22898-01-7 Sodium 2,2,3,3-tetrafluoropropionate
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)]
Assessed
SupplierTel:+86-571-82512721
Address:No 317,Jingling Road,Guali Town,Xiaoshan District
- Contact Suppliers
CAS No.22898-01-7 Sodium 2,2,3,3-tetrafluoropropionate
Assay:99% Appearance:white powder Package:According to the customer's requestment Storage:Store in dry dark and ventilated place Transportation:Fast! Safe! Promise 100% safe and successful transportation. Door to door transportation services. Application:Pharmaceutical Intermediates ect.
Min. Order:1Kilogram
Supplier:Zibo Dorne chemical technology co. LTD [ China (Mainland)]
Assessed
SupplierTel:+86-18560316533
Address:No. 416, 4th floor, zhongguancun science and technology city, no. 1, west 6th road, zhangdian district
- Contact Suppliers
CAS No.22898-01-7 Sodium 2,2,3,3-tetrafluoropropionate CAS: 22898-01-7
Assay:99% Appearance:Brown powder Package:According to customer requirements Storage:Avoid light, ventilation and shade Transportation:Sea or Air Application:Medical research field
Min. Order:1Gram
Supplier:Qingdao Beluga Import and Export Co., LTD [ China (Mainland)]
Assessed
SupplierTel:+8613854236000
Address:qingdao
- Contact Suppliers
CAS No.22898-01-7 Sodium 2,2,3,3-tetrafluoropropionate
Assay: 98%Min Appearance:Detailed in specifications Package:According to customer Storage:Store in dry, dark and ventilated place Transportation:By air or by sea Application:An important raw material and intermediate used in organic Synthesis, Pharmaceuticals
Min. Order:1Kilogram
Supplier:TAIZHOU ZHENYU BIOTECHNOLOGY CO., LTD [ China (Mainland)]
Assessed
SupplierTel:15867601896
Address:Room 623 Yulan Square Bussiness Building . Jiaojiang Taizhou Zhejiang 318000 China
- Contact Suppliers
CAS No.22898-01-7 flupropanate-sodium
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)]
Assessed
SupplierTel:+86-189 8945 5137
Address:Jian Qiao Community, 789 Shenhua Road, Xihu District, Hangzhou, China, 310000
- Contact Suppliers
CAS No.22898-01-7 Agrochemical HerbicideTETRAPION (FLUPROPANATE-SODIUM) 60% TC, 745G/LT CAS NO.22898-01-7 CAS NO.22898-01-7
Assay:99% Appearance:White Powder Package:25kg/drum, also according to the clients requirement Storage:Store In Dry, Cool And Ventilated Place Transportation:By Sea Or By Air Application:It is widely used as a thickener, emulsifier and stabilizer
Min. Order:1Kilogram
Supplier:EAST CHEMSOURCES LIMITED [ China (Mainland)]
Assessed
SupplierTel:15053231572
Address:No.1581-12,Jinshui Road, Licang, Qingdao,China
- Contact Suppliers
CAS No.22898-01-7 Propanoic acid,2,2,3,3-tetrafluoro-, sodium salt (1:1)
Assay: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)]
Assessed
SupplierTel:+86 18369939125
Address:No.25A Qilu Industrial Park
- Contact Suppliers
CAS No.22898-01-7 Sodium 2,2,3,3-tetrafluoropropionate
Assay:99% Appearance:Off white to slight yellow solid Package:25kg/drum;200kg/drum Storage:Stored in shaded, cool and dry places Transportation:Sea/air/courier Application:pharma intermediate
Min. Order:0
Supplier:Antimex Chemical Limied [ China (Mainland)]
Assessed
SupplierTel:0086-21-50563169
Address:Room1027,No.Jinyu Road,Pudong
- Contact Suppliers
CAS No.22898-01-7 Sodium 2,2,3,3-tetrafluoropropionate
Assay:HPLC鈮?8% Appearance:powder Storage:Sealed in dry,Room Temperature Transportation:by express or by sea Application:for pharma use
Min. Order:0
Supplier:Hangzhou Shanyi Biotechnology Co., Ltd. [ China (Mainland)]
Assessed
SupplierTel:s-086-18093761022
Address:Guodu Development Building
- Contact Suppliers
CAS No.22898-01-7 sodium 2,2,3,3-tetrafluoropropionate
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)]
Assessed
SupplierTel:86-29-86107037-8015
Address:No.11 Daqing Road,Lianhu District,Xi鈥檃n 710082,China
- Contact Suppliers
CAS No.22898-01-7 Sodium 2,2,3,3-tetrafluoropropionate
Min. Order:0
Supplier:ORCHID CHEMICAL SUPPLIES LTD [ China (Mainland)]
Assessed
SupplierTel:+86-571-85395792
Address:607, North Zhongshan Road, Hangzhou 310000 China
- Contact Suppliers
CAS No.22898-01-7 Agrochemical HerbicideTETRAPION (FLUPROPANATE-SODIUM) 60% TC, 745G/LT CAS NO.22898-01-7 CAS NO.22898-01-7
Assay:99% Appearance:White Powder Package:10g,20g,50g,100g,500g,1kgs,5kgs,10kgs,25kgs per bag / drum / bottle Storage:Store in Cool and dry .place, keep away from strong light, high temperature Transportation:Buy sea,buy air Application:high-efficacy disinfectant
Min. Order:20Metric Ton
Supplier:Jilin Artel New Materials Co., LTD [ China (Mainland)]
Premium
SupplierTel:+86-19990500590
Address:Dianshi Plazza,Chaoyang District
- Contact Suppliers
CAS No.22898-01-7 Agrochemical HerbicideTETRAPION (FLUPROPANATE-SODIUM) 60% TC, 745G/LT CAS NO.22898-01-7 CAS NO.22898-01-7 CAS NO.22898-01-7
Assay:99% Appearance:White powder or granule Package:25kg drum/bag Storage:Keep in dry and cool place Transportation:by Sea, air and express Application:Used as a calcium booster in the food industry
Min. Order:1Metric Ton
Supplier:KAISA GROUP INC [ United States]
Premium
SupplierTel:+1(314锛?54-83-86
Address:1312 17th Street Suite 1402 Denver CO 80202
- Contact Suppliers
CAS No.22898-01-7 Propanoic acid,2,2,3,3-tetrafluoro-, sodium salt (1:1)
Assay:99% Package:drum Transportation:By Sea/Air/DHL Application:chemical
Min. Order:0
Supplier:Henan Wentao Chemical Product Co., Ltd. [ China (Mainland)]
Premium
SupplierTel:+86-370-2722992
Address:32 Room, 5th Floor, Building 11, No. 6 Yinxing Road, High-tech Industrial Development Zone, Zhengzhou City, Henan Province
- Contact Suppliers
CAS No.22898-01-7 Agrochemical HerbicideTETRAPION (FLUPROPANATE-SODIUM) 60% TC, 745G/LT CAS NO.22898-01-7 CAS NO.22898-01-7
Assay:99% Application:API
Min. Order:0
Supplier:Hebei Muhuang Technology Co., Ltd [ China (Mainland)]
Premium
SupplierTel:+8618332173750锛?8613191862208
Address:鐭冲搴勬ˉ瑗垮尯浠佸拰鍢夊洯3鍙锋ゼ1鍗曞厓702
- Contact Suppliers
CAS No.22898-01-7 Pharmaceutical Grade CAS 22898-01-7 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:Chemical raw materials, pharmaceutical intermediates, cosmetic raw materials, etc.
Min. Order:1Kilogram
Supplier:Zhuozhou Wenxi import and Export Co., Ltd [ China (Mainland)]
Premium
SupplierTel:+86-13111626072
Address:Room 1710, Baoxin International Phase I, 19 Guanyun East Road, Zhuozhou, Hebei
- Contact Suppliers
CAS No.22898-01-7 Sodium 2,2,3,3-tetrafluoropropionate
Assay:99%min Appearance:white or almost white powder Package:1kg/drum, 25kg/drum, 200kg/drum,500kg/drum Storage:Keep it in dry, cool and ventilated place Transportation:by sea or by air Application:For scientific research
Min. Order:1Kilogram
Supplier:Shanghai Seasonsgreen Chemical Co.,Ltd [ China (Mainland)]
Premium
SupplierTel:+86 156 1855 4368
Address:No.12, Lane 356, Chengnan Road, Chuansha Town, Shanghai
- Contact Suppliers
CAS No.22898-01-7 Agrochemical HerbicideTETRAPION (FLUPROPANATE-SODIUM) 60% TC, 745G/LT CAS NO.22898-01-7 CAS NO.22898-01-7
Assay:99% Appearance:liquid or powder Package:according to the clients requirement Storage:Dry and Cool Place Transportation:UPS FedEx ,DHL,EXPRESS LINE Application:healing drugs
Min. Order:1Gram
Supplier:Shandong Mopai Biotechnology Co., LTD [ China (Mainland)]
Premium
SupplierTel:+86-15965530500
Address:shandong
- Contact Suppliers
CAS No.22898-01-7 Sodium 2,2,3,3-tetrafluoropropionate
Assay:99.0% Appearance:Clear, colorless liquid Package:according to your requirement Storage:Store in a dry, dark and ventilated place Transportation:by air/by sea /by train Application:lt is an important raw material and intermediate used in Organic Synthesis, Pharmaceuticals, Agrochemicals and Dyestuff.
Min. Order:1Kilogram
Supplier:Suzhou Senfeida Chemical Co., Ltd [ China (Mainland)]
Premium
SupplierTel:186-624-33356
Address:Hushuguan Economic and Technological Development Zone, Suzhou High-tech Zone
- Contact Suppliers
CAS No.22898-01-7 Agrochemical HerbicideTETRAPION (FLUPROPANATE-SODIUM) 60% TC, 745G/LT CAS NO.22898-01-7 CAS NO.22898-01-7
Assay:99% Appearance:white powder Package:drum or based on customers' requirement Storage:normal temperature storage Transportation:by sea, by air Application:We have different specifications for different applications
Min. Order:1Metric Ton
Supplier:Bluecrystal chem-union [ China (Mainland)]
Premium
SupplierTel:+86-1895157
Address:Liang Xi Qu
- Contact Suppliers
CAS No.22898-01-7 Sodium 2,2,3,3-(Sodium)-3-tetrafluoropropionate cas no.22898-01-7 0.98
Assay:0.98 Package:Grams, Kilograms Transportation:According to customer request Application:For R&D
Min. Order:0
Supplier:Win-Win chemical Co.Ltd [ China (Mainland)]
Premium
SupplierTel:0086-577-64498589
Address:6F, No. 396 Xingping Road, Longwan Industrial Zone, Wenzhou City, Zhejiang, 325000 P.R.China
- Contact Suppliers
CAS No.22898-01-7 sodium 2,2,3,3-tetrafluoropropionate
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:Greenutra Resource Inc [ China (Mainland)]
Premium
SupplierTel:0086-411-39553357
Address:No. 7-1-1802, Huizhi Garden,Ocean Square,Dalian, 116033, China
- Contact Suppliers
CAS No.22898-01-7 Propanoic acid,2,2,3,3-tetrafluoro-, sodium salt (1:1) 22898-01-7
Assay:90% 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)]
Premium
SupplierTel:0086-182-2994-0868
Address:Buiding4,Lugu Enterprise Plaza, Yuelu Distric
- Contact Suppliers
CAS No.22898-01-7 Sodium 2,2,3,3-tetrafluoropropionate
Assay:HPLC鈮?8% Appearance:powder Storage:Sealed in dry,Room Temperature Transportation:by express or by sea Application:for pharma use
Min. Order:0
Supplier:Falcon Life Sciences Pvt. Ltd [ China (Mainland)]
Premium
SupplierTel:+86-1320721613-17791785910
Address:No.53 Da Qing Lu
- Contact Suppliers
CAS No.22898-01-7 Propanoic acid,2,2,3,3-tetrafluoro-, sodium salt (1:1)
Appearance:95%+ Package:R&D,Pilot run Transportation:per client require
Min. Order:0
Supplier:Hunan chemfish Pharmaceutical co.,Ltd [ China (Mainland)]
Premium
SupplierTel:0731-85567275
Address:Innovation center , Meixi Lake ,Yuelu district ,Changsha City, Hunan Province , China
- Contact Suppliers
CAS No.22898-01-7 Sodium 2,2,3,3-tetrafluoropropionate
Assay:95% Appearance:white crystals Application:For research use only.
Min. Order:0
Supplier:BOC Sciences [ United States]
Premium
SupplierTel:1-631-485-4226
Address:Ramsey Road
- Contact Suppliers
CAS No.22898-01-7 sodium 2,2,3,3-tetrafluoropropionate
Assay:98% Application:fluorine compound
Min. Order:0
Supplier:SHANDONG BENRITE NEW CHEMICAL MATERIALS CO.,LTD. [ China (Mainland)]
Premium
SupplierTel:86-0533-2866658
Address: Zibo Science and Technology Industrial Park, Zibo City,Shandong Province
- Contact Suppliers
CAS No.22898-01-7 Agrochemical HerbicideTETRAPION (FLUPROPANATE-SODIUM) 60% TC, 745G/LT CAS NO.22898-01-7 CAS NO.22898-01-7
Assay:99% Application:Agrochemical HerbicideTETRAPION (FLUPROPANATE-SODIUM) 60% TC, 745G/LT CAS NO.22898-01-7 CAS NO.22898-01-7
Min. Order:0
Supplier:Wuhan 90000 Lithium Industry and Trade Co., Ltd. [ China (Mainland)]
Premium
SupplierTel:+86-027-83214688
Address:666 Gaoxin Avenue, Donghu New Technology Development Zone, Wuhan City, Hubei Province, China
- Contact Suppliers
CAS No.22898-01-7 Sodium 2,2,3,3-tetrafluoropropionate
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)]
Premium
SupplierTel:+86-0371-87507775
Address:No 260 Dongming Road,Jinshui District
- Contact Suppliers
- Zibo Dorne chemical technology co. LTD
- China (Mainland)
- Tel:+86-18560316533
- No. 416, 4th floor, zhongguancun science and technology city, no. 1, west 6th road, zhangdian district
- 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
- SHANDONG BENRITE NEW CHEMICAL MATERIALS CO.,LTD.
- China (Mainland)
- Tel:86-0533-2866658
- Zibo Science and Technology Industrial Park, Zibo City,Shandong Province
- Hangzhou Shanyi Biotechnology Co., Ltd.
- China (Mainland)
- Tel:s-086-18093761022
- Guodu Development Building
- KAISA GROUP INC
- United States
- Tel:+1(314)954-83-86
- 1312 17th Street Suite 1402 Denver CO 80202
- KAISA GROUP INC
- United States
- Tel:+1(314)954-83-86
- 1312 17th Street Suite 1402 Denver CO 80202
- KAISA GROUP INC
- United States
- Tel:+1(314)954-83-86
- 1312 17th Street Suite 1402 Denver CO 80202
- KAISA GROUP INC
- United States
- Tel:+1(314)954-83-86
- 1312 17th Street Suite 1402 Denver CO 80202
- Falcon Life Sciences Pvt. Ltd
- China (Mainland)
- Tel:+86-1320721613-17791785910
- No.53 Da Qing Lu
- TAIZHOU ZHENYU BIOTECHNOLOGY CO., LTD
- China (Mainland)
- Tel:15867601896
- Room 623 Yulan Square Bussiness Building . Jiaojiang Taizhou Zhejiang 318000 China
- Shandong Mopai Biotechnology Co., LTD
- China (Mainland)
- Tel:+86-15965530500
- shandong
- Suzhou Senfeida Chemical Co., Ltd
- China (Mainland)
- Tel:186-624-33356
- Hushuguan Economic and Technological Development Zone, Suzhou High-tech Zone
- Hebei Muhuang Technology Co., Ltd
- China (Mainland)
- Tel:+8618332173750,+8613191862208
- 石家庄桥西区仁和嘉园3号楼1单元702
- Bluecrystal chem-union
- China (Mainland)
- Tel:+86-1895157
- Liang Xi Qu
- Qingdao Beluga Import and Export Co., LTD
- China (Mainland)
- Tel:+8613854236000
- qingdao
- Qingdao Beluga Import and Export Co., LTD
- China (Mainland)
- Tel:+8613854236000
- qingdao
- 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
- 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
- Chemlyte Solutions
- China (Mainland)
- Tel:+86-189 8945 5137
- Jian Qiao Community, 789 Shenhua Road, Xihu District, Hangzhou, China, 310000
- 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
- Jilin Artel New Materials Co., LTD
- China (Mainland)
- Tel:+86-19990500590
- Dianshi Plazza,Chaoyang District
- Jilin Artel New Materials Co., LTD
- China (Mainland)
- Tel:+86-19990500590
- Dianshi Plazza,Chaoyang District
- Jilin Artel New Materials Co., LTD
- China (Mainland)
- Tel:+86-19990500590
- Dianshi Plazza,Chaoyang District
- 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
- Shanghai Seasonsgreen Chemical Co.,Ltd
- China (Mainland)
- Tel:+86 156 1855 4368
- No.12, Lane 356, Chengnan Road, Chuansha Town, Shanghai
- EAST CHEMSOURCES LIMITED
- China (Mainland)
- Tel:15053231572
- No.1581-12,Jinshui Road, Licang, Qingdao,China
- 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
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