CAS号是公开的化学物质信息的最权威的集合。CAS号涵盖从1957年至今的科学文献中确定的物质，其他物质可追溯到20世纪初。它也称CAS编号(CAS Registry Number，或称CAS
Number，CAS Rn，CAS #)，又称CAS登录号或CAS登记号码，是某种物质(化合物、高分子材料、生物序列(Biological
sequences)、混合物或合金)的唯一的数字识别号码。美国化学会的下设组织化学文摘社(Chemical Abstracts
Service，简称CAS)负责为每一种出现在文献中的物质分配一个CAS编号，其目的是为了避免化学物质有多种名称的麻烦，使数据库的检索更为方便。如今几乎所有的化学数据库都允许用CAS编号检索。
| 名称 |
英文名 |
物理化学性质 |
CAS号 |
分子式 |
| 2,2-Difluoro-1-(3-methylpyridin-2-yl)ethan-1-amine
|
2,2-Difluoro-1-(3-methylpyridin-2-yl)ethan-1-amine
|
分子量：172.18
密度：N/A
沸点：N/A
熔点：N/A
|
2090650-67-0
|
C8H10F2N2
|
| 2-Pyridinesulfonamide, 5-(chloromethyl)-4-(difluoromethyl)-
|
2-Pyridinesulfonamide, 5-(chloromethyl)-4-(difluoromethyl)-
|
分子量：256.66
密度：N/A
沸点：N/A
熔点：N/A
|
1805305-16-1
|
C7H7ClF2N2O2S
|
| 3-(2,2,3,3-Tetrafluoropropyl)azetidin-3-ol
|
3-(2,2,3,3-Tetrafluoropropyl)azetidin-3-ol
|
分子量：187.14
密度：N/A
沸点：N/A
熔点：N/A
|
1935580-18-9
|
C6H9F4NO
|
| Methyl 3,5-Difluoro-2,6-dimethoxybenzoate
|
Methyl 3,5-Difluoro-2,6-dimethoxybenzoate
|
分子量：232.18
密度：N/A
沸点：N/A
熔点：N/A
|
2116770-98-8
|
C10H10F2O4
|
| [4-(2-Bromo-1,3-thiazol-4-yl)phenyl]methanol
|
[4-(2-Bromo-1,3-thiazol-4-yl)phenyl]methanol
|
分子量：270.15
密度：N/A
沸点：N/A
熔点：N/A
|
2090261-89-3
|
C10H8BrNOS
|
| 2-(Bromomethyl)-1,1-difluorocyclobutane
|
2-(Bromomethyl)-1,1-difluorocyclobutane
|
分子量：185.01
密度：N/A
沸点：N/A
熔点：N/A
|
2624135-87-9
|
C5H7BrF2
|
| 4-Bromo-2-chloro-5-iodobenzaldehyde
|
4-Bromo-2-chloro-5-iodobenzaldehyde
|
分子量：345.36
密度：N/A
沸点：N/A
熔点：N/A
|
2091701-35-6
|
C7H3BrClIO
|
| B-(1-Ethyl-1,2-dihydro-2-oxo-4-pyridinyl)boronic acid
|
B-(1-Ethyl-1,2-dihydro-2-oxo-4-pyridinyl)boronic acid
|
分子量：166.97
密度：N/A
沸点：N/A
熔点：N/A
|
1588769-26-9
|
C7H10BNO3
|
| (3R)-3-(Propan-2-yl)-1,4-diazepan-2-one
|
(3R)-3-(Propan-2-yl)-1,4-diazepan-2-one
|
分子量：156.23
密度：N/A
沸点：N/A
熔点：N/A
|
2090218-87-2
|
C8H16N2O
|
| 6-Methyl-2-[(methylamino)methyl]-3,4-dihydropyrimidin-4-one
|
6-Methyl-2-[(methylamino)methyl]-3,4-dihydropyrimidin-4-one
|
分子量：153.18
密度：N/A
沸点：N/A
熔点：N/A
|
1281488-46-7
|
C7H11N3O
|
| 3-Bromo-2-fluoro-5-iodobenzaldehyde
|
3-Bromo-2-fluoro-5-iodobenzaldehyde
|
分子量：328.90
密度：N/A
沸点：N/A
熔点：N/A
|
2091143-73-4
|
C7H3BrFIO
|
| 5,8-Dioxaspiro[3.5]nonan-9-one
|
5,8-Dioxaspiro[3.5]nonan-9-one
|
分子量：142.15
密度：N/A
沸点：N/A
熔点：N/A
|
2138075-46-2
|
C7H10O3
|
| 2-(Propan-2-yl)-4-(pyrrolidin-1-yl)pyrrolidine
|
2-(Propan-2-yl)-4-(pyrrolidin-1-yl)pyrrolidine
|
分子量：182.31
密度：N/A
沸点：N/A
熔点：N/A
|
2138245-90-4
|
C11H22N2
|
| 4-(Difluoromethyl)piperidine-1-sulfonyl chloride
|
4-(Difluoromethyl)piperidine-1-sulfonyl chloride
|
分子量：233.66
密度：N/A
沸点：N/A
熔点：N/A
|
1934840-56-8
|
C6H10ClF2NO2S
|
| 4-(3-Oxocyclobutyl)benzoic acid
|
4-(3-Oxocyclobutyl)benzoic acid
|
分子量：190.19
密度：N/A
沸点：N/A
熔点：N/A
|
2138072-56-5
|
C11H10O3
|
| 1-Methyl-4-[4-(trifluoromethyl)-1,3-thiazol-2-yl]-1,4-diazepane
|
1-Methyl-4-[4-(trifluoromethyl)-1,3-thiazol-2-yl]-1,4-diazepane
|
分子量：265.30
密度：N/A
沸点：N/A
熔点：N/A
|
2548992-24-9
|
C10H14F3N3S
|
| Benzoic acid, 3-(bromomethyl)-6-cyano-2-(trifluoromethyl)-, ethyl ester
|
Benzoic acid, 3-(bromomethyl)-6-cyano-2-(trifluoromethyl)-, ethyl ester
|
分子量：336.10
密度：N/A
沸点：N/A
熔点：N/A
|
1805591-07-4
|
C12H9BrF3NO2
|
| Benzoic acid, 2-chloro-3-cyano-5-(difluoromethoxy)-, ethyl ester
|
Benzoic acid, 2-chloro-3-cyano-5-(difluoromethoxy)-, ethyl ester
|
分子量：275.63
密度：N/A
沸点：N/A
熔点：N/A
|
1805469-85-5
|
C11H8ClF2NO3
|
| 1-chloro-1-[2-chloro-4-(fluoromethyl)phenyl]propan-2-one
|
1-chloro-1-[2-chloro-4-(fluoromethyl)phenyl]propan-2-one
|
分子量：235.08
密度：N/A
沸点：N/A
熔点：N/A
|
1803760-69-1
|
C10H9Cl2FO
|
| Ethyl 2-chloro-3-cyano-4-fluorobenzoate
|
Ethyl 2-chloro-3-cyano-4-fluorobenzoate
|
分子量：227.62
密度：N/A
沸点：N/A
熔点：N/A
|
1807006-43-4
|
C10H7ClFNO2
|
| Ethyl 2-chloro-3-cyano-6-fluorobenzoate
|
Ethyl 2-chloro-3-cyano-6-fluorobenzoate
|
分子量：227.62
密度：N/A
沸点：N/A
熔点：N/A
|
1807165-53-2
|
C10H7ClFNO2
|
| 4-(Trifluoromethyl)thiophene-3-carbothioamide
|
4-(Trifluoromethyl)thiophene-3-carbothioamide
|
分子量：211.2
密度：N/A
沸点：N/A
熔点：N/A
|
2225136-18-3
|
C6H4F3NS2
|
| 2-Azabicyclo[2.1.1]hexane-2-carbonyl chloride
|
2-Azabicyclo[2.1.1]hexane-2-carbonyl chloride
|
分子量：145.59
密度：N/A
沸点：N/A
熔点：N/A
|
2225146-34-7
|
C6H8ClNO
|
| Ethyl 2-(2-((5-hydroxypentyl)oxy)ethoxy)acetate
|
Ethyl 2-(2-((5-hydroxypentyl)oxy)ethoxy)acetate
|
分子量：234.29
密度：N/A
沸点：N/A
熔点：N/A
|
2361118-26-3
|
C11H22O5
|
| 3-[(Dimethylamino)methyl]azetidine-1-carbonyl chloride
|
3-[(Dimethylamino)methyl]azetidine-1-carbonyl chloride
|
分子量：176.64
密度：N/A
沸点：N/A
熔点：N/A
|
1856671-99-2
|
C7H13ClN2O
|
| (Pyrrolidin-3-yl)methanesulfonyl fluoride
|
(Pyrrolidin-3-yl)methanesulfonyl fluoride
|
分子量：167.20
密度：N/A
沸点：N/A
熔点：N/A
|
1934637-70-3
|
C5H10FNO2S
|
| Benzenesulfonyl chloride, 3-(chloromethyl)-4-cyano-2-ethyl-
|
Benzenesulfonyl chloride, 3-(chloromethyl)-4-cyano-2-ethyl-
|
分子量：278.15
密度：N/A
沸点：N/A
熔点：N/A
|
1807144-56-4
|
C10H9Cl2NO2S
|
| 5-(3-methyl-1,2-oxazol-5-yl)-1H-pyrazole-4-carboxylic acid
|
5-(3-methyl-1,2-oxazol-5-yl)-1H-pyrazole-4-carboxylic acid
|
分子量：193.16
密度：N/A
沸点：N/A
熔点：N/A
|
2091458-84-1
|
C8H7N3O3
|
| 5-(5-methyl-1,2-oxazol-3-yl)-1H-pyrazole-4-carboxylic acid
|
5-(5-methyl-1,2-oxazol-3-yl)-1H-pyrazole-4-carboxylic acid
|
分子量：193.16
密度：N/A
沸点：N/A
熔点：N/A
|
2091110-96-0
|
C8H7N3O3
|
| 2-[1-(Aminomethyl)-2-methylcyclopentyl]propan-2-ol
|
2-[1-(Aminomethyl)-2-methylcyclopentyl]propan-2-ol
|
分子量：171.28
密度：N/A
沸点：N/A
熔点：N/A
|
1855770-43-2
|
C10H21NO
|
| 1-[(2-Chlorophenyl)amino]-3-fluoropropan-2-ol
|
1-[(2-Chlorophenyl)amino]-3-fluoropropan-2-ol
|
分子量：203.64
密度：N/A
沸点：N/A
熔点：N/A
|
1860983-30-7
|
C9H11ClFNO
|
| 2-(Bromomethyl)-2-methyloxane
|
2-(Bromomethyl)-2-methyloxane
|
分子量：193.08
密度：N/A
沸点：N/A
熔点：N/A
|
1934399-84-4
|
C7H13BrO
|
| 4-[4-[(Trimethylsilyl)ethynyl]phenyl]morpholine
|
4-[4-[(Trimethylsilyl)ethynyl]phenyl]morpholine
|
分子量：259.42
密度：N/A
沸点：N/A
熔点：N/A
|
1583305-71-8
|
C15H21NOSi
|
| 2-((4-Chlorophenyl)ethynyl)-5-fluorobenzaldehyde
|
2-((4-Chlorophenyl)ethynyl)-5-fluorobenzaldehyde
|
分子量：258.67
密度：N/A
沸点：N/A
熔点：N/A
|
1939148-83-0
|
C15H8ClFO
|
| 5-Fluoro-2-((4-fluorophenyl)ethynyl)benzaldehyde
|
5-Fluoro-2-((4-fluorophenyl)ethynyl)benzaldehyde
|
分子量：242.22
密度：N/A
沸点：N/A
熔点：N/A
|
1814960-21-8
|
C15H8F2O
|
| 3-Hydroxy-4-iodobenzo[b]thiophene-2-carboxylic acid
|
3-Hydroxy-4-iodobenzo[b]thiophene-2-carboxylic acid
|
分子量：320.11
密度：N/A
沸点：N/A
熔点：N/A
|
1935643-33-6
|
C9H5IO3S
|
| Ethyl 1-oxadispiro[2.0.3^{4}.3^{3}]decane-2-carboxylate
|
Ethyl 1-oxadispiro[2.0.3^{4}.3^{3}]decane-2-carboxylate
|
分子量：210.27
密度：N/A
沸点：N/A
熔点：N/A
|
1866027-13-5
|
C12H18O3
|
| 7-Hydroxy-8-[2-[2-nitro-4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]diazenyl]-2-naphthalenesulfonic acid
|
7-Hydroxy-8-[2-[2-nitro-4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]diazenyl]-2-naphthalenesulfonic acid
|
分子量：561.5
密度：N/A
沸点：N/A
熔点：N/A
|
28535-20-8
|
C18H15N3O12S3
|
| 4-Hydroxy-3-[2-[2-nitro-4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]diazenyl]-2,7-naphthalenedisulfonic acid
|
4-Hydroxy-3-[2-[2-nitro-4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]diazenyl]-2,7-naphthalenedisulfonic acid
|
分子量：641.6
密度：N/A
沸点：N/A
熔点：N/A
|
28535-16-2
|
C18H15N3O15S4
|
| N-[5-[[1-(5-Acetyl-4-hydroxy-2,6-dioxo-2H-pyran-3(6H)-ylidene)ethyl]amino]-2-hydroxyphenyl]acetamide
|
N-[5-[[1-(5-Acetyl-4-hydroxy-2,6-dioxo-2H-pyran-3(6H)-ylidene)ethyl]amino]-2-hydroxyphenyl]acetamide
|
分子量：360.3
密度：N/A
沸点：N/A
熔点：N/A
|
64353-89-5
|
C17H16N2O7
|
| 7-Methyl-4-oxo-3,4-dihydropyrido[2,3-d]pyrimidine-6-carboxylic acid
|
7-Methyl-4-oxo-3,4-dihydropyrido[2,3-d]pyrimidine-6-carboxylic acid
|
分子量：205.17
密度：N/A
沸点：N/A
熔点：N/A
|
1282105-06-9
|
C9H7N3O3
|
| N-(6-(4-mercaptophenyl)pyridazin-3-yl)acetamide
|
N-(6-(4-mercaptophenyl)pyridazin-3-yl)acetamide
|
分子量：245.30
密度：N/A
沸点：N/A
熔点：N/A
|
1286706-01-1
|
C12H11N3OS
|
| methyl 2-{4-oxo-1H,4H,5H-pyrazolo[3,4-d]pyrimidin-1-yl}acetate
|
methyl 2-{4-oxo-1H,4H,5H-pyrazolo[3,4-d]pyrimidin-1-yl}acetate
|
分子量：208.17
密度：N/A
沸点：N/A
熔点：N/A
|
1311316-89-8
|
C8H8N4O3
|
| 1-tert-butyl-6-hydrazinyl-1H,4H,5H-pyrazolo[3,4-d]pyrimidin-4-one
|
1-tert-butyl-6-hydrazinyl-1H,4H,5H-pyrazolo[3,4-d]pyrimidin-4-one
|
分子量：222.25
密度：N/A
沸点：N/A
熔点：N/A
|
1311316-36-5
|
C9H14N6O
|
| 1-tert-butyl-6-hydrazinyl-1H,4H,5H-pyrazolo[3,4-d]pyrimidine
|
1-tert-butyl-6-hydrazinyl-1H,4H,5H-pyrazolo[3,4-d]pyrimidine
|
分子量：208.26
密度：N/A
沸点：N/A
熔点：N/A
|
1311316-97-8
|
C9H16N6
|
| 11-Nitro-8lambda6-thia-2,3,5,7-tetraazatricyclo[7.4.0.0,2,6]trideca-1(13),3,5,9,11-pentaene-8,8-dione
|
11-Nitro-8lambda6-thia-2,3,5,7-tetraazatricyclo[7.4.0.0,2,6]trideca-1(13),3,5,9,11-pentaene-8,8-dione
|
分子量：267.22
密度：N/A
沸点：N/A
熔点：N/A
|
1311315-45-3
|
C8H5N5O4S
|
| 2-(3-Chlorophenyl)-5-methyl-7-(2,4,5-trimethoxyphenyl)-4,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxamide
|
2-(3-Chlorophenyl)-5-methyl-7-(2,4,5-trimethoxyphenyl)-4,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxamide
|
分子量：455.9
密度：N/A
沸点：N/A
熔点：N/A
|
539815-51-5
|
C22H22ClN5O4
|
| 9,9-Dimethyl-3,6-dinitrofluorene-2,7-diol
|
9,9-Dimethyl-3,6-dinitrofluorene-2,7-diol
|
分子量：316.26
密度：N/A
沸点：N/A
熔点：N/A
|
1189567-59-6
|
C15H12N2O6
|
| 2-(2,3,4,5,6-pentafluorophenyl)-5-(trifluoromethyl)-4H-pyrazol-3-one
|
2-(2,3,4,5,6-pentafluorophenyl)-5-(trifluoromethyl)-4H-pyrazol-3-one
|
分子量：318.12
密度：N/A
沸点：N/A
熔点：N/A
|
1191255-55-6
|
C10H2F8N2O
|
| 5-Bromo-1-ethyl-6-methylpyridin-2(1H)-one
|
5-Bromo-1-ethyl-6-methylpyridin-2(1H)-one
|
分子量：216.07
密度：N/A
沸点：N/A
熔点：N/A
|
1611464-85-7
|
C8H10BrNO
|