Building Blocks

Esta sección contiene productos fundamentales para la síntesis de compuestos orgánicos y biológicos. Los bloques de construcción son los materiales de partida esenciales utilizados para construir moléculas complejas a través de diversas reacciones químicas. Desempeñan un papel crítico en el descubrimiento de fármacos, la ciencia de materiales y la investigación química. En CymitQuimica, ofrecemos una gama diversa de bloques de construcción de alta calidad para apoyar sus investigaciones innovadoras y proyectos industriales, asegurando que tenga los componentes esenciales para una síntesis exitosa.

Subcategorías de "Building Blocks"

Ácidos borónicos y derivados del ácido borónico

Building Blocks quirales

Building Blocks de hidrocarburos

Building Blocks orgánicos

Productos de "Building Blocks"

100
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productos por página. Hay 262917 productos en esta categoría.

Datos del producto	Pureza	Rango de precios	Entrega estimada
(S)-A-Amino-3,5-difluorobenzenebutanoic acid REF: 3D-KAC59701CAS: 1260597-01-0	Min. 95%	A consultar	Mar 03 Dic 24
(R)-1-Boc-2-acetyl-piperidine REF: 3D-KAC60132CAS: 1260601-32-8	Min. 95%	A consultar	Mar 03 Dic 24
(3S,4S)-Ethyl4-methylpyrrolidine-3-carboxylate REF: 3D-KAC60317CAS: 1260603-17-5	Min. 95%	A consultar	Mar 03 Dic 24
(3S)-3-{[(tert-Butoxy)carbonyl]amino}-3-cyclopropylpropanoic acid REF: 3D-KAC60409CAS: 1260604-09-8	Min. 95%	A consultar	Mar 03 Dic 24
(3S)-3-Cyclopropyl-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoic acid REF: 3D-KAC60512CAS: 1260605-12-6	Min. 95%	A consultar	Mar 03 Dic 24
(2S)-3-(2,3-Difluorophenyl)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoic acid REF: 3D-KAC60530CAS: 1260605-30-8	Min. 95%	A consultar	Mar 03 Dic 24
(R)-A-Amino-3,5-difluorobenzenebutanoic acid REF: 3D-KAC60615CAS: 1260606-15-2	Min. 95%	A consultar	Mar 03 Dic 24
2,4-Difluoro-D-homophenylalanine REF: 3D-KAC60831CAS: 1260608-31-8	Min. 95%	A consultar	Mar 03 Dic 24
N-Fmoc-(S)-4-fluorohomophenylalanine REF: 3D-KAC60885CAS: 1260608-85-2	Min. 95%	A consultar	Mar 03 Dic 24
(2R)-2-({[(9H-Fluoren-9-yl)methoxy]carbonyl}amino)-2-(3-fluorophenyl)acetic acid REF: 3D-KAC60892CAS: 1260608-92-1	Min. 95%	A consultar	Mar 03 Dic 24
(S)-A-(Fmoc-amino)-3-methoxybenzeneacetic acid REF: 3D-KAC60939CAS: 1260609-39-9	Min. 95%	A consultar	Mar 03 Dic 24
2-Methyl-L-homophenylalanine REF: 3D-KAC61036CAS: 1260610-36-3	Min. 95%	A consultar	Mar 03 Dic 24
3,4-Difluoro-D-homophenylalanine REF: 3D-KAC61037CAS: 1260610-37-4	Min. 95%	A consultar	Mar 03 Dic 24
(R)-tert-Butyl 4-(bromomethyl)-2,2-dimethyloxazolidine-3-carboxylate REF: 3D-KAC61079CAS: 1260610-79-4	Min. 95%	A consultar	Mar 03 Dic 24
(S)-A-Amino-2-chloro-benzenebutanoic acid REF: 3D-KAC61109CAS: 1260611-09-3	Min. 95%	A consultar	Mar 03 Dic 24
(S)-2-Amino-4-(3-methoxyphenyl)butanoic acid REF: 3D-KAC61113CAS: 1260611-13-9	Min. 95%	A consultar	Mar 03 Dic 24
(3S)-3-({[(9H-Fluoren-9-yl)methoxy]carbonyl}amino)-3-(4-phenylphenyl)propanoic acid REF: 3D-KAC61367CAS: 1260613-67-9	Min. 95%	A consultar	Mar 03 Dic 24
2,5-Difluoro-D-homophenylalanine REF: 3D-KAC61373CAS: 1260613-73-7	Min. 95%	A consultar	Mar 03 Dic 24
2-Methyl-D-homophenylalanine REF: 3D-KAC61475CAS: 1260614-75-2	Min. 95%	A consultar	Mar 03 Dic 24
(S)-3-(2,5-Dichlorophenyl)-2-(FMOC-amino)propionic acid REF: 3D-KAC61480CAS: 1260614-80-9	Min. 95%	A consultar	Mar 03 Dic 24
(2R)-4-(4-Bromophenyl)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanoic acid REF: 3D-KAC61507CAS: 1260615-07-3	Min. 95%	A consultar	Mar 03 Dic 24
(R)-3-Cyclohexyl-3-(9H-fluoren-9-ylmethoxycarbonylamino)-propionic acid REF: 3D-KAC61610CAS: 1260616-10-1	Min. 95%	A consultar	Mar 03 Dic 24
Fmoc-3,4-dichloro-L-homophenylalanine REF: 3D-KAC61612CAS: 1260616-12-3	Min. 95%	A consultar	Mar 03 Dic 24
2,3-Difluoro-L-homophenylalanine REF: 3D-KAC61660CAS: 1260616-60-1	Min. 95%	A consultar	Mar 03 Dic 24
(S)-tert-Butyl 2-(2-chloroacetyl)azetidine-1-carboxylate REF: 3D-KAC61694CAS: 1260616-94-1	Min. 95%	A consultar	Mar 03 Dic 24
(R)-4-Boc-6-hydroxy-[1,4]oxazepane ee REF: 3D-KAC61696CAS: 1260616-96-3	Min. 95%	A consultar	Mar 03 Dic 24
(2S,4S)-1-{[(9H-fluoren-9-yl)methoxy]carbonyl}-4-phenoxypyrrolidine-2-carboxylic acid REF: 3D-KAC61748CAS: 1260617-48-8	Min. 95%	A consultar	Mar 03 Dic 24
(R)-3-Fluorohomophenylalanine REF: 3D-KAC61848CAS: 1260618-48-1	Min. 95%	A consultar	Mar 03 Dic 24
(R)-A-Amino-3-methoxybenzenebutanoic acid REF: 3D-KAC61862CAS: 1260618-62-9	Min. 95%	A consultar	Mar 03 Dic 24
tert-Butyl (2S)-2-ethynylpiperidine-1-carboxylate REF: 3D-KAC61933CAS: 1260619-33-7	Min. 95%	A consultar	Mar 03 Dic 24
(R)-tert-Butyl 5-methyl-1,4-diazepane-1-carboxylate REF: 3D-KAC61938CAS: 1260619-38-2	Min. 95%	53,00 €~857,00 €	Mar 03 Dic 24
4-(Propan-2-yl)-1,2-oxazole-3-carboxylic acid REF: 3D-KAC62117CAS: 1260621-17-7	Min. 95%	A consultar	Mar 03 Dic 24
4-Ethyl-1,2-oxazole-3-carboxylic acid REF: 3D-KAC62118CAS: 1260621-18-8	Min. 95%	A consultar	Mar 03 Dic 24
4-(Propan-2-yl)-1H-pyrazole-3-carboxylic acid REF: 3D-KAC62119CAS: 1260621-19-9	Min. 95%	A consultar	Mar 03 Dic 24
2-Chloro-N-(4-phenyl-1,2-oxazol-5-yl)acetamide REF: 3D-KAC62185CAS: 1260621-85-9	Min. 95%	A consultar	Mar 03 Dic 24
6-Methyl-1,2,3,4-tetrahydro-isoquinoline-1-carboxylic acid hydrochloride REF: 3D-KAC63711CAS: 1260637-11-3	Min. 95%	115,00 €~912,00 €	Mar 03 Dic 24
3-(3-Phenylphenyl)piperazin-2-one REF: 3D-KAC63731CAS: 1260637-31-7	Min. 95%	A consultar	Mar 03 Dic 24
Ethyl 3-{[(tert-butoxy)carbonyl]amino}-6-oxabicyclo[3.1.0]hexane-3-carboxylate REF: 3D-KAC63734CAS: 1260637-34-0	Min. 95%	A consultar	Mar 03 Dic 24
Ethyl 6-bromo-1,2,3,4-tetrahydroisoquinoline-1-carboxylate hydrochloride REF: 3D-KAC63767CAS: 1260637-67-9	Min. 95%	A consultar	Mar 03 Dic 24
6-Bromo-2-(tert-butoxycarbonyl)-1,2,3,4-tetrahydroisoquinoline-1-carboxylic acid REF: 3D-KAC63811CAS: 1260638-11-6	Min. 95%	A consultar	Mar 03 Dic 24
2-Cbz-6-bromo-3,4-dihydro-1H-isoquinoline-1-carboxylic acid REF: 3D-KAC63855CAS: 1260638-55-8	Min. 95%	A consultar	Mar 03 Dic 24
Ethyl 2-amino-2-(6-chloropyrazin-2-yl)acetate REF: 3D-KAC63882CAS: 1260638-82-1	Min. 95%	A consultar	Mar 03 Dic 24
1-tert-Butyl 2-ethyl azetidine-1,2-dicarboxylate REF: 3D-KAC63922CAS: 1260639-22-2	Min. 95%	A consultar	Mar 03 Dic 24
3-(3-Phenoxyphenyl)pyrrolidine REF: 3D-KAC63952CAS: 1260639-52-8	Min. 95%	A consultar	Mar 03 Dic 24
tert-Butyl 2-(3-amino-2-oxopyrrolidin-1-yl)acetate REF: 3D-KAC63973CAS: 1260639-73-3	Min. 95%	A consultar	Mar 03 Dic 24
Ethyl 6-methoxy-1,2,3,4-tetrahydro-isoquinoline-1-carboxylate REF: 3D-KAC63989CAS: 1260639-89-1	Min. 95%	A consultar	Mar 03 Dic 24
1-(Bromomethyl)-2,5-difluoro-4-nitrobenzene REF: 3D-KAC64004CAS: 1260640-04-7	Min. 95%	A consultar	Mar 03 Dic 24
6-Fluoro-1,2,3,4-tetrahydro-isoquinoline-1-carboxylic acid ethyl ester REF: 3D-KAC64016CAS: 1260640-16-1	Min. 95%	A consultar	Mar 03 Dic 24
8-Chloro-4-quinolinecarboxaldehyde REF: 3D-KBA83988CAS: 35839-88-4	Min. 95%	A consultar	Mar 03 Dic 24
4-Methoxy-2-methylbutanoic acid REF: 3D-KBA84141CAS: 35841-41-9	Min. 95%	A consultar	Mar 03 Dic 24
2-Ethyl-4-methoxybutanoic acid REF: 3D-KBA84142CAS: 35841-42-0	Min. 95%	A consultar	Mar 03 Dic 24
3-(Bromomethyl)-3-(chloromethyl)oxetane REF: 3D-KBA84260CAS: 35842-60-5	Min. 95%	A consultar	Mar 03 Dic 24
Methyl 4-(aminomethyl)-5-methylfuran-2-carboxylate hydrochloride REF: 3D-KBA84291CAS: 35842-91-2	Min. 95%	A consultar	Mar 03 Dic 24
2-(7-Chloro-1H-indazol-3-yl)acetic acid REF: 3D-KBA84523CAS: 35845-23-9	Min. 95%	A consultar	Mar 03 Dic 24
4-Methoxyphenylsulfonylethanol REF: 3D-KBA84800CAS: 35848-00-1	Min. 95%	A consultar	Mar 03 Dic 24
4-(1,3-Dioxolan-2-yl)benzoic acid REF: 3D-KBA84902CAS: 35849-02-6	Min. 95%	A consultar	Mar 03 Dic 24
3-Amino-1,2,3,4-tetrahydroquinolin-2-one hydrochloride REF: 3D-KBA84931CAS: 35849-31-1	Min. 95%	A consultar	Mar 03 Dic 24
1-(3-Bromoprop-1-yn-1-yl)-2-methylbenzene REF: 3D-KBA85122CAS: 35851-22-0	Min. 95%	A consultar	Mar 03 Dic 24
2,6-Dibromo-4-trifluoromethylphenol REF: 3D-KBA85257CAS: 35852-57-4	Min. 95%	A consultar	Mar 03 Dic 24
3-chloro-4-nitro-1H-pyrazole REF: 3D-KBA85275CAS: 35852-75-6	Min. 95%	A consultar	Mar 03 Dic 24
4-[(4-Methoxyphenyl)methyl]pyridine REF: 3D-KBA85435CAS: 35854-35-4	Min. 95%	A consultar	Mar 03 Dic 24
2-[(4-Methoxyphenyl)methyl]pyridine REF: 3D-KBA85445CAS: 35854-45-6	Min. 95%	A consultar	Mar 03 Dic 24
3-Phenylimidazo[1,5-a]pyridine REF: 3D-KBA85446CAS: 35854-46-7	Min. 95%	A consultar	Mar 03 Dic 24
cis-6-Nonen-1-ol REF: 3D-KBA85486CAS: 35854-86-5	Min. 95%	A consultar	Mar 03 Dic 24
2-Amino-1-(1-pyrrolidinyl)-1-ethanone hydrochloride REF: 3D-KBA85514CAS: 35855-14-2	Min. 95%	A consultar	Mar 03 Dic 24
3-[(2-Methoxyethyl)amino]propanenitrile REF: 3D-KBA85566CAS: 35855-66-4	Min. 95%	A consultar	Mar 03 Dic 24
3-Chloro-1-(3,4-dichlorophenyl)-1-propanone REF: 3D-KBA85766CAS: 35857-66-0	Min. 95%	A consultar	Mar 03 Dic 24
2,2-Dimethyl-3-phenylpropanenitrile REF: 3D-KBA86345CAS: 35863-45-7	Min. 95%	A consultar	Mar 03 Dic 24
3,3-Dimethyl-1-nitrobutan-2-one REF: 3D-KBA86941CAS: 35869-41-1	Min. 95%	A consultar	Mar 03 Dic 24
5-(3,4-Dimethylphenyl)pentanoic acid REF: 3D-KBA87249CAS: 35872-49-2	Min. 95%	A consultar	Mar 03 Dic 24
N,N-Dipropylsulfamoyl chloride REF: 3D-KBA87727CAS: 35877-27-1	Min. 95%	A consultar	Mar 03 Dic 24
1-benzyl-1H-pyrazolo[3,4-d]pyrimidin-4-ol REF: 3D-KBA87737CAS: 35877-37-3	Min. 95%	A consultar	Mar 03 Dic 24
rac-(3aR,8aS)-Hexahydro-1H-cyclohepta[C]furan-1,3(3aH)-dione REF: 3D-KBA87829CAS: 35878-29-6	Min. 95%	A consultar	Mar 03 Dic 24
2-Methoxy-6,7,8,9-tetrahydro-5H-benzo[7]annulen-6-amine hydrochloride REF: 3D-KBA88116CAS: 35881-16-4	Min. 95%	A consultar	Mar 03 Dic 24
4-Benzylcyclohexan-1-one REF: 3D-KBA88377CAS: 35883-77-3	Min. 95%	A consultar	Mar 03 Dic 24
1-(4-Chloro-2,6-dimethylphenyl)ethanone REF: 3D-KBA88771CAS: 35887-71-9	Min. 95%	A consultar	Mar 03 Dic 24
4-Chloro-2,6-dimethylbenzoic acid REF: 3D-KBA88772CAS: 35887-72-0	Min. 95%	A consultar	Mar 03 Dic 24
2-(4-Cyclohexylphenyl)acetic acid REF: 3D-KBA88900CAS: 35889-00-0	Min. 95%	A consultar	Mar 03 Dic 24
Benzyl 1H-pyrrole-2-carboxylate REF: 3D-KBA88987CAS: 35889-87-3	Min. 95%	A consultar	Mar 03 Dic 24
Methyl 3-(tert-butoxy)-2,2-dimethylpropanoate REF: 3D-KBA88999CAS: 35889-99-7	Min. 95%	A consultar	Mar 03 Dic 24
2-Amino-N-(2,6-dimethylphenyl)acetamide hydrochloride REF: 3D-KBA89183CAS: 35891-83-9	Min. 95%	A consultar	Mar 03 Dic 24
N-(2,6-Dimethylphenyl)-2-(methylamino)acetamide hydrochloride REF: 3D-KBA89184CAS: 35891-84-0	Min. 95%	A consultar	Mar 03 Dic 24
2H,4H,5H,6H-Furo[3,2-b]pyridin-2-one REF: 3D-KBA89435CAS: 35894-35-0	Min. 95%	A consultar	Mar 03 Dic 24
7-Oxoheptanoic acid REF: 3D-KBA92365CAS: 35923-65-0	Min. 95%	A consultar	Mar 03 Dic 24
Methyl 2-(3,4-dichlorophenyl)-2-hydroxyacetate REF: 3D-KBA92527CAS: 35925-27-0	Min. 95%	A consultar	Mar 03 Dic 24
(4-Hydroxyphenyl)(pyridin-3-yl)methanone REF: 3D-KBA92615CAS: 35926-15-9	Min. 95%	A consultar	Mar 03 Dic 24
2-Iodo-5-methylphenol REF: 3D-KBA92880CAS: 35928-80-4	Min. 95%	A consultar	Mar 03 Dic 24
2-(5-Methylfuran-2-yl)ethanol REF: 3D-KBA94294CAS: 35942-94-0	Min. 95%	A consultar	Mar 03 Dic 24
2,5-Diisopropylphenol REF: 3D-KBA94691CAS: 35946-91-9	Min. 95%	A consultar	Mar 03 Dic 24
1-Amino-3-o-tolyloxy-propan-2-ol REF: 3D-KBA94873CAS: 35948-73-3	Min. 95%	A consultar	Mar 03 Dic 24
2-Bromo-5-(2-nitroprop-1-en-1-yl)furan REF: 3D-KBA95037CAS: 35950-37-9	Min. 95%	A consultar	Mar 03 Dic 24
Ethyl 2,5-dihydro-1H-pyrrole-3-carboxylate hydrochloride REF: 3D-KBA95774CAS: 35957-74-5	Min. 95%	A consultar	Mar 03 Dic 24
4-(4-Bromophenyl)-2,3-dihydro-1,3-oxazol-2-one REF: 3D-KBA96211CAS: 35962-11-9	Min. 95%	A consultar	Mar 03 Dic 24
8-Chloro-4-hydroxyquinoline-3-carboxylic acid REF: 3D-KBA96616CAS: 35966-16-6	Min. 95%	A consultar	Mar 03 Dic 24
4-Hydroxy-8-methylquinoline-3-carboxylic acid REF: 3D-KBA96617CAS: 35966-17-7	Min. 95%	A consultar	Mar 03 Dic 24
2-(2-Oxopropyl)pyridine-3-carboxylic acid REF: 3D-KBA96949CAS: 35969-49-4	Min. 95%	A consultar	Mar 03 Dic 24
2-(2-Ethoxy-2-oxoethyl)nicotinic acid REF: 3D-KBA96951CAS: 35969-51-8	Min. 95%	A consultar	Mar 03 Dic 24
2-Ethoxy-nicotinic acid REF: 3D-KBA96954CAS: 35969-54-1	Min. 95%	A consultar	Mar 03 Dic 24
6-Bromo-3-pentyl-2-sulfanyl-3,4-dihydroquinazolin-4-one REF: 3D-KBA96998CAS: 35969-98-3	Min. 95%	A consultar	Mar 03 Dic 24
2-Bromo-1-(3,4-dihydro-2H-1,5-benzodioxepin-7-yl)ethan-1-one REF: 3D-KBA97034CAS: 35970-34-4	Min. 95%	A consultar	Mar 03 Dic 24

50mg		177,00 €
500mg		666,00 €

50mg		317,00 €
500mg		1.189,00 €

5mg		363,00 €
50mg		1.448,00 €

25mg		297,00 €
250mg		1.110,00 €

Building Blocks

Subcategorías de "Building Blocks"

Ácidos borónicos y derivados del ácido borónico

Building Blocks quirales

Building Blocks de hidrocarburos

Building Blocks orgánicos

Productos de "Building Blocks"

(S)-A-Amino-3,5-difluorobenzenebutanoic acid

Ref: 3D-KAC59701

(R)-1-Boc-2-acetyl-piperidine

Ref: 3D-KAC60132

(3S,4S)-Ethyl4-methylpyrrolidine-3-carboxylate

Ref: 3D-KAC60317

(3S)-3-{[(tert-Butoxy)carbonyl]amino}-3-cyclopropylpropanoic acid

Ref: 3D-KAC60409

(3S)-3-Cyclopropyl-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoic acid

Ref: 3D-KAC60512

(2S)-3-(2,3-Difluorophenyl)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoic acid

Ref: 3D-KAC60530

(R)-A-Amino-3,5-difluorobenzenebutanoic acid

Ref: 3D-KAC60615

2,4-Difluoro-D-homophenylalanine

Ref: 3D-KAC60831

N-Fmoc-(S)-4-fluorohomophenylalanine

Ref: 3D-KAC60885

(2R)-2-({[(9H-Fluoren-9-yl)methoxy]carbonyl}amino)-2-(3-fluorophenyl)acetic acid

Ref: 3D-KAC60892

(S)-A-(Fmoc-amino)-3-methoxybenzeneacetic acid

Ref: 3D-KAC60939

2-Methyl-L-homophenylalanine

Ref: 3D-KAC61036

3,4-Difluoro-D-homophenylalanine

Ref: 3D-KAC61037

(R)-tert-Butyl 4-(bromomethyl)-2,2-dimethyloxazolidine-3-carboxylate

Ref: 3D-KAC61079

(S)-A-Amino-2-chloro-benzenebutanoic acid

Ref: 3D-KAC61109

(S)-2-Amino-4-(3-methoxyphenyl)butanoic acid

Ref: 3D-KAC61113

(3S)-3-({[(9H-Fluoren-9-yl)methoxy]carbonyl}amino)-3-(4-phenylphenyl)propanoic acid

Ref: 3D-KAC61367

2,5-Difluoro-D-homophenylalanine

Ref: 3D-KAC61373

2-Methyl-D-homophenylalanine

Ref: 3D-KAC61475

(S)-3-(2,5-Dichlorophenyl)-2-(FMOC-amino)propionic acid

Ref: 3D-KAC61480

(2R)-4-(4-Bromophenyl)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanoic acid

Ref: 3D-KAC61507

(R)-3-Cyclohexyl-3-(9H-fluoren-9-ylmethoxycarbonylamino)-propionic acid

Ref: 3D-KAC61610

Fmoc-3,4-dichloro-L-homophenylalanine

Ref: 3D-KAC61612

2,3-Difluoro-L-homophenylalanine

Ref: 3D-KAC61660

(S)-tert-Butyl 2-(2-chloroacetyl)azetidine-1-carboxylate

Ref: 3D-KAC61694

(R)-4-Boc-6-hydroxy-[1,4]oxazepane ee

Ref: 3D-KAC61696

(2S,4S)-1-{[(9H-fluoren-9-yl)methoxy]carbonyl}-4-phenoxypyrrolidine-2-carboxylic acid

Ref: 3D-KAC61748

(R)-3-Fluorohomophenylalanine

Ref: 3D-KAC61848

(R)-A-Amino-3-methoxybenzenebutanoic acid

Ref: 3D-KAC61862

tert-Butyl (2S)-2-ethynylpiperidine-1-carboxylate

Ref: 3D-KAC61933

(R)-tert-Butyl 5-methyl-1,4-diazepane-1-carboxylate

Ref: 3D-KAC61938

4-(Propan-2-yl)-1,2-oxazole-3-carboxylic acid

Ref: 3D-KAC62117

4-Ethyl-1,2-oxazole-3-carboxylic acid

Ref: 3D-KAC62118

4-(Propan-2-yl)-1H-pyrazole-3-carboxylic acid

Ref: 3D-KAC62119

2-Chloro-N-(4-phenyl-1,2-oxazol-5-yl)acetamide

Ref: 3D-KAC62185

6-Methyl-1,2,3,4-tetrahydro-isoquinoline-1-carboxylic acid hydrochloride

Ref: 3D-KAC63711

3-(3-Phenylphenyl)piperazin-2-one