7-AMINO-3,4-DIHYDRO-1H-ISOQUINOLINE-2-CARBOXYLIC ACID TERT-BUTYL ESTER(171049-41-5)
- CAS Registry Number:
- 171049-41-5
- Synonyms:
- 7-Amino-2-(tert-butoxycarbonyl)-1,2,3,4-tetrahydroisoquinoline;7-Amino-2-(tert-butyloxycarbonyl)-1,2,3,4-tetrahydroisoquinoline;7-Amino-2-Boc-1,2,3,4-tetrahydroisoquinoline;7-Amino-3,4-dihydro-1H-isoquinoline-2-carboxylic acid tert-butylester;tert-Butyl7-amino-3,4-dihydroisoquinoline-2(1H)-carboxylate;
- Molecular Formula:
- C14H20N2O2
- Molecular Weight:
- 248.325
- EINECS:
- -0
CAS No.:171049-41-5
Name: 7-AMINO-3,4-DIHYDRO-1H-ISOQUINOLINE-2-CARBOXYLIC ACID TERT-BUTYL ESTER
Related Suppliers
CAS No.171049-41-5 tert-Butyl 7-amino-3,4-dihydroisoquinoline-2(1H)-carboxylate 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.171049-41-5 tert-butyl 7-amino-1,2,3,4-tetrahydroisoquinoline-2-carboxylate
Assay:99%min. Appearance:white powder Package:1kg/Export worthy packing; 25kg/drum Storage:In well-closed container, protected from light and in cool & dry place. Transportation:By Air, By Sea, By courier (door to door, DHL/FedEx/UPS) Application:R&D and production for pharmaceuticals and chemicals
Min. Order:1Gram
Supplier:LIDE PHARMACEUTICALS LIMITED [
China (Mainland)] 
Assessed
SupplierTel:+86-25-58409506
Address:11F, Building A1, No.288 North Zhongshan Road, Gulou District, Nanjing,210003, P.R.China.
- Contact Suppliers
CAS No.171049-41-5 7-AMINO-3,4-DIHYDRO-1H-ISOQUINOLINE-2-CARBOXYLIC ACID TERT-BUTYL ESTER
Assay:97% Appearance:powder Package:according to your need for packing Storage:Keep in dark place,Inert atmosphere,2-8掳C Transportation:sea,air,courier Application:intermediate
Min. Order:1Gram
Supplier:Shanghai Minstar Chemical Co., Ltd [
China (Mainland)] 
Assessed
SupplierTel:86-21-18019205509
Address:BUILDING 8, NO.1098, CHUANSHA ROAD, SHANGHAI, CHINA
- Contact Suppliers
CAS No.171049-41-5 tert-Butyl 7-amino-3,4-dihydroisoquinoline-2(1H)-carboxylate Manufacturer/High quality/Best price/In stock CAS NO.171049-41-5
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.171049-41-5 7-AMINO-3,4-DIHYDRO-1H-ISOQUINOLINE-2-CARBOXYLIC ACID TERT-BUTYL ESTER
Assay:99% Appearance:white powder Package:According to the customer's requestment Storage:According to the customer's requestmen Transportation:Fast! Safe! Promise 100% safe and successful transportation. Door to door transportation services. Application:An important raw material and intermed
Min. Order:1Gram
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.171049-41-5 7-AMINO-3,4-DIHYDRO-1H-ISOQUINOLINE-2-CARBOXYLIC ACID TERT-BUTYL ESTER CAS:171049-41-5
Assay:99% Appearance:Brown powder Package:According to customer requirements Storage:Avoid light, ventilation and shade Transportation:Sea or Air Application:It is an important raw material and intermediate
Min. Order:1Gram
Supplier:Qingdao Beluga Import and Export Co., LTD [
China (Mainland)] 
Assessed
SupplierTel:+8613854236000
Address:qingdao
- Contact Suppliers
CAS No.171049-41-5 7-AMINO-3,4-DIHYDRO-1H-ISOQUINOLINE-2-CARBOXYLIC ACID TERT-BUTYL ESTER
Assay:NLT 98% Appearance:White powder Package:Aluminum bag/Carton Drum Storage:Store in a tightly closed container, in a cool and dry place. Transportation:By air Application:Used in producing API
Min. Order:0
Supplier:Hangzhou Huarong Pharm Co., Ltd. [
China (Mainland)] 
Assessed
SupplierTel:+86-571-86758373
Address:Room1101, Hakim International Building, Gongshu District, Hangzhou, Zhejiang Province, China.
- Contact Suppliers
CAS No.171049-41-5 tert-Butyl 7-amino-3,4-dihydroisoquinoline-2(1H)-carboxylate
Assay:98% Appearance:detailed see specifications Package:25kg/drum;200kg/drum Storage:Keep away of light, cool place Transportation:Sea/air/courier Application:It is an important raw material and intermediate used in Organic Synthesis, Pharmaceuticals, Agrochemicals and Dyestuff.
Min. Order:0
Supplier:Antimex Chemical Limied [
China (Mainland)] Assessed
SupplierTel:0086-21-50563169
Address:Room1027,No.Jinyu Road,Pudong
- Contact Suppliers
CAS No.171049-41-5 7-Amino-3,4-dihydro-1H-isoquinoline-2-carboxylic acid tert-butyl ester
Assay:98%, 99% Appearance:Refer to COA Package:According to clients' requirement Storage:Store in dry, cool and ventilated place Transportation:By sea or by air or by courier Application:As organic intermediates, chemical reagents and etc.
Min. Order:0
Supplier:Hangzhou Ocean Chemical Co., Ltd. [
China (Mainland)] Assessed
SupplierTel:+86-571-88025872, 28272092, 28272096
Address:Room 623 ,Building No 1 , COFCO Radius Commercial Center Xiwen Road, Xiacheng District, Hangzhou, Zhejiang Province, China
- Contact Suppliers
CAS No.171049-41-5 7-AMINO-3,4-DIHYDRO-1H-ISOQUINOLINE-2-CARBOXYLIC ACID TERT-BUTYL ESTER
Assay:99% Package:25/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: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.171049-41-5 7-Amino-2-Boc-1,2,3,4-tetrahydroisoquinoline
Assay:98% Package:Grams, Kilograms Transportation:According to customer request Application:For R&D
Min. Order:0
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.171049-41-5 7-Amino-3,4-dihydro-1H-isoquinoline-2-carboxylic acid tert-butyl ester
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)] 
Assessed
SupplierTel:+86-571-86217390
Address:No.567 Dengcai Street,Sandun,Westlake District,Hangzhou310030,Zhejiang,China.
- Contact Suppliers
CAS No.171049-41-5 tert-Butyl 7-amino-3,4-dihydroisoquinoline-2(1H)-carboxylate
Assay:97% Application:Chemical intermediate
Min. Order:0
Supplier:HANGZHOU TIANYE CHEMICALS CO., LTD. [
China (Mainland)] 
Assessed
SupplierTel:0571-85083592
Address:1208# HuaCe Building-B,Wuchanggang Road,XIHU District,Hangzhou City,Zhejiang Province ,China
- Contact Suppliers
CAS No.171049-41-5 171049-41-5
Assay:99% Application:Organic Chemicals
Min. Order:0
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.171049-41-5 7-Amino-3,4-dihydro-1H-isoquinoline-2-carboxylic acid tert-butyl ester
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)] 
Premium
SupplierTel:+86-571-87396432
Address:No.200 Zhenhua Rd.Xihu Industrial Park, Hangzhou 310030, China
- Contact Suppliers
CAS No.171049-41-5 tert-Butyl 7-amino-3,4-dihydroisoquinoline-2(1H)-carboxylate
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)] Premium
SupplierTel:+852-30606658
Address:EASEY COMM BLDG 253-261 HENNESSY ROAD Hong Kong, China
- Contact Suppliers
CAS No.171049-41-5 7-AMINO-3,4-DIHYDRO-1H-ISOQUINOLINE-2-CARBOXYLIC ACID TERT-BUTYL ESTER
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)] Premium
SupplierTel:+86-13437180835
Address: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)
- Contact Suppliers
CAS No.171049-41-5 tert-Butyl 7-amino-3,4-dihydroisoquinoline-2(1H)-carboxylate cas 171049-41-5
Assay:99%min Appearance:white crystalline powder Package:25KG drum Storage:Store in dry, dark and ventilated place Transportation:by air, by sea, by express Application:intermediate
Min. Order:0
Supplier:Hangzhou Fandachem Co.,Ltd [
China (Mainland)] Premium
SupplierTel:+86-571-28800458
Address:Room 5010, No.9 YanAn Road,Hangzhou,Zhejiang,China
- Contact Suppliers
CAS No.171049-41-5 Top Purity CAS 171049-41-5 with fast shipping
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.171049-41-5 7-AMINO-3,4-DIHYDRO-1H-ISOQUINOLINE-2-CARBOXYLIC ACID TERT-BUTYL ESTER
Assay:99% Appearance:liquid or powder Package:according to the clients requirement Storage:Dry and Cool Place Transportation:UPS FedEx ,DHL,EXPRESS LINE Application:API
Min. Order:1Gram
Supplier:Shandong Mopai Biotechnology Co., LTD [
China (Mainland)] 
Premium
SupplierTel:+86-15965530500
Address:shandong
- Contact Suppliers
CAS No.171049-41-5 7-Amino-2-Boc-1,2,3,4-tetrahydroisoquinoline
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)] Premium
SupplierTel:86-571-89925085
Address:Watts Cosine.No.166.Xiangmao Road.
- Contact Suppliers
CAS No.171049-41-5 tert-butyl 7-amino-1,2,3,4-tetrahydroisoquinoline-2-carboxylate
Assay:99.3% Appearance:white or Almost colorless Package:2.5kg or 5kg Transportation:Air freight, sea freight, and express delivery Application:intermediate
Min. Order:4Kilogram
Supplier:SHANGHAI T&W PHARMACEUTICAL CO., LTD. [
China (Mainland)] Premium
SupplierTel:+86-21-61551611
Address:601, No. 1, 2277 Nong, Zu Chongzhi Road, Zhangjiang Hightech. Park, Pudong
- Contact Suppliers
CAS No.171049-41-5 2-Boc-7-Amino-1,2,3,4-tetrahydroisoquinoline
Assay:98%min Appearance:95%+ Package:R&D,Pilot run Transportation:per client require Application:Products are widely used in adhesives, dye, medicine ,resin and ceramic coating etc. Industry
Min. Order:0Metric Ton
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.171049-41-5 171049-41-5 2(1H)-Isoquinolinecarboxylic acid, 7-amino-3,4-dihydro-,1,1-dimethylethyl ester Shanghai Sunway Pharmaceutical Technology Co.,Ltd.
Assay:99% Storage:room or cold temperature
Min. Order:0Metric Ton
Supplier:Shanghai Sunway Pharmaceutical Technology Co.,Ltd. [
China (Mainland)] 
Premium
SupplierTel:+86-21-5161 3915
Address:Shanghai YangPu
- Contact Suppliers
CAS No.171049-41-5 2-Boc-7-Amino-1,2,3,4-tetrahydroisoquinoline 171049-41-5
Assay:95% 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.171049-41-5 7-AMINO-3,4-DIHYDRO-1H-ISOQUINOLINE-2-CARBOXYLIC ACID TERT-BUTYL ESTER CAS No.171049-41-5
Assay:99.90% Appearance:solid or liquid Package:As customer's requested Storage:sealed in cool and dry place Transportation:by courier/air/sea Application:Pharma Intermediate
Min. Order:0
Supplier:Guangdong Juda Chemical Industrial Co.,Limited [
China (Mainland)] Premium
SupplierTel:+86-15527996628
Address:Guangzhou chemical city Tianhe District Guangzhou Guangdong China
- Contact Suppliers
CAS No.171049-41-5 7-AMINO-3,4-DIHYDRO-1H-ISOQUINOLINE-2-CARBOXYLIC ACID TERT-BUTYL ESTER
Assay:99% Application:API
Min. Order:0
Supplier:NUTROCHEM- MANUFACTURE PLACE [
South Africa] Premium
SupplierTel:27-838631975
Address:Stasieweg 019 Bethal Bethal Mpumalanga
- 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
- Hangzhou Huarong Pharm Co., Ltd.
- China (Mainland)
- Tel:+86-571-86758373
- Room1101, Hakim International Building, Gongshu District, Hangzhou, Zhejiang Province, China.
- SHANGHAI T&W PHARMACEUTICAL CO., LTD.
- China (Mainland)
- Tel:+86-21-61551611
- 601, No. 1, 2277 Nong, Zu Chongzhi Road, Zhangjiang Hightech. Park, Pudong
- LIDE PHARMACEUTICALS LIMITED
- China (Mainland)
- Tel:+86-25-58409506
- 11F, Building A1, No.288 North Zhongshan Road, Gulou District, Nanjing,210003, P.R.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
- Hangzhou Ocean Chemical Co., Ltd.
- China (Mainland)
- Tel:+86-571-88025872, 28272092, 28272096
- Room 623 ,Building No 1 , COFCO Radius Commercial Center Xiwen Road, Xiacheng District, Hangzhou, Zhejiang Province, China
- NUTROCHEM- MANUFACTURE PLACE
South Africa- Tel:27-838631975
- Stasieweg 019 Bethal Bethal Mpumalanga
- Shandong Mopai Biotechnology Co., LTD
- China (Mainland)
- Tel:+86-15965530500
- shandong
- 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
- 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
- Qingdao Beluga Import and Export Co., LTD
- China (Mainland)
- Tel:+8613854236000
- qingdao
- 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
- Guangdong Juda Chemical Industrial Co.,Limited
- China (Mainland)
- Tel:+86-15527996628
- Guangzhou chemical city Tianhe District Guangzhou Guangdong China
- 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
- Zibo Hangyu Biotechnology Development Co., Ltd
- China (Mainland)
- Tel:86-15965530500
- Room1701, Tianxing Building,Licheng district, jinan, Shandong, China
- Zibo Hangyu Biotechnology Development Co., Ltd
- China (Mainland)
- Tel:86-15965530500
- Room1701, Tianxing Building,Licheng district, jinan, Shandong, China
- Zibo Hangyu Biotechnology Development Co., Ltd
- China (Mainland)
- Tel:86-15965530500
- Room1701, Tianxing Building,Licheng district, jinan, Shandong, China
- Zibo Hangyu Biotechnology Development Co., Ltd
- China (Mainland)
- Tel:86-15965530500
- Room1701, Tianxing Building,Licheng district, jinan, Shandong, China
- Hangzhou Fandachem Co.,Ltd
- China (Mainland)
- Tel:+86-571-28800458
- Room 5010, No.9 YanAn Road,Hangzhou,Zhejiang,China
- Shanghai Minstar Chemical Co., Ltd
- China (Mainland)
- Tel:86-21-18019205509
- BUILDING 8, NO.1098, CHUANSHA ROAD, SHANGHAI, CHINA
- HENAN NEW BLUE CHEMICAL CO.,LTD
- China (Mainland)
- Tel:86-371-55170693/55170694
- Zhengzhou International Trade New Territory,Jinshui District,Zhengzhou ,China
- GIHI CHEMICALS CO.,LIMITED
- China (Mainland)
- Tel:+86-571-86217390
- No.567 Dengcai Street,Sandun,Westlake District,Hangzhou310030,Zhejiang,China.
- Hangzhou J&H Chemical Co., Ltd.
- China (Mainland)
- Tel:+86-571-87396432
- No.200 Zhenhua Rd.Xihu Industrial Park, Hangzhou 310030, 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