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噻吩并嘧啶酮衍生物

中文名称 英文名称 CAS号 化学式 结构式图片
—— N-[2-[(11-methyl-12-oxo-7-thia-9,11-diazatricyclo[6.4.0.02,6]dodeca-1(8),2(6),9-trien-10-yl)sulfanyl]acetyl]thiophene-2-carboxamide —— C17H15N3O3S3
N-[2-[(11-methyl-12-oxo-7-thia-9,11-diazatricyclo[6.4.0.02,6]dodeca-1(8),2(6),9-trien-10-yl)sulfanyl]acetyl]thiophene-2-carboxamide
—— 2-[[(7R)-3-(2-methoxyphenyl)-7-(2-methylbutan-2-yl)-4-oxo-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanyl]-N-(4-methylphenyl)acetamide —— C31H35N3O3S2
2-[[(7R)-3-(2-methoxyphenyl)-7-(2-methylbutan-2-yl)-4-oxo-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanyl]-N-(4-methylphenyl)acetamide
—— methyl 4-[2-[(3S)-3-(4-methoxyphenyl)-5-phenyl-3,4-dihydropyrazol-2-yl]-2-oxoethyl]sulfanyl-2,5-dimethylthieno[2,3-d]pyrimidine-6-carboxylate —— C28H26N4O4S2
methyl 4-[2-[(3S)-3-(4-methoxyphenyl)-5-phenyl-3,4-dihydropyrazol-2-yl]-2-oxoethyl]sulfanyl-2,5-dimethylthieno[2,3-d]pyrimidine-6-carboxylate
—— methyl 4-[2-[(3R)-3-(4-methoxyphenyl)-5-phenyl-3,4-dihydropyrazol-2-yl]-2-oxoethyl]sulfanyl-2,5-dimethylthieno[2,3-d]pyrimidine-6-carboxylate —— C28H26N4O4S2
methyl 4-[2-[(3R)-3-(4-methoxyphenyl)-5-phenyl-3,4-dihydropyrazol-2-yl]-2-oxoethyl]sulfanyl-2,5-dimethylthieno[2,3-d]pyrimidine-6-carboxylate
—— N-(2,3-dimethylphenyl)-2-[[(7R)-3-(2-methoxyphenyl)-7-(2-methylbutan-2-yl)-4-oxo-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanyl]acetamide —— C32H37N3O3S2
N-(2,3-dimethylphenyl)-2-[[(7R)-3-(2-methoxyphenyl)-7-(2-methylbutan-2-yl)-4-oxo-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanyl]acetamide
—— N-(2-methyl-4-oxopentan-2-yl)-3-[(4-oxo-5,6,7,8-tetrahydro-3H-[1]benzothiolo[2,3-d]pyrimidin-2-yl)sulfanyl]propanamide —— C19H25N3O3S2
N-(2-methyl-4-oxopentan-2-yl)-3-[(4-oxo-5,6,7,8-tetrahydro-3H-[1]benzothiolo[2,3-d]pyrimidin-2-yl)sulfanyl]propanamide
—— N-(2-tert-butylphenyl)-2-[[(7R)-3-[2-(4-fluorophenyl)ethyl]-7-methyl-4-oxo-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanyl]acetamide —— C31H34FN3O2S2
N-(2-tert-butylphenyl)-2-[[(7R)-3-[2-(4-fluorophenyl)ethyl]-7-methyl-4-oxo-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanyl]acetamide
—— 2-[[(7S)-3-(2-methoxyphenyl)-7-(2-methylbutan-2-yl)-4-oxo-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanyl]-N-(4-methylphenyl)acetamide —— C31H35N3O3S2
2-[[(7S)-3-(2-methoxyphenyl)-7-(2-methylbutan-2-yl)-4-oxo-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanyl]-N-(4-methylphenyl)acetamide
—— N-(2-tert-butylphenyl)-2-[[(7S)-3-[2-(4-fluorophenyl)ethyl]-7-methyl-4-oxo-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanyl]acetamide —— C31H34FN3O2S2
N-(2-tert-butylphenyl)-2-[[(7S)-3-[2-(4-fluorophenyl)ethyl]-7-methyl-4-oxo-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanyl]acetamide
—— N-(2,3-dimethylphenyl)-2-[[(7S)-3-(2-methoxyphenyl)-7-(2-methylbutan-2-yl)-4-oxo-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanyl]acetamide —— C32H37N3O3S2
N-(2,3-dimethylphenyl)-2-[[(7S)-3-(2-methoxyphenyl)-7-(2-methylbutan-2-yl)-4-oxo-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanyl]acetamide
—— ethyl 5-methyl-4-oxo-2-[(1S)-1-(pyridine-3-carbonyloxy)ethyl]-3H-thieno[2,3-d]pyrimidine-6-carboxylate —— C18H17N3O5S
ethyl 5-methyl-4-oxo-2-[(1S)-1-(pyridine-3-carbonyloxy)ethyl]-3H-thieno[2,3-d]pyrimidine-6-carboxylate
—— 2-[[(7S)-7-methyl-3-(2-methylphenyl)-4-oxo-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanyl]-N-(4-methyl-2-nitrophenyl)acetamide —— C27H26N4O4S2
2-[[(7S)-7-methyl-3-(2-methylphenyl)-4-oxo-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanyl]-N-(4-methyl-2-nitrophenyl)acetamide
—— N-[(3S)-1,1-dioxothiolan-3-yl]-N-ethyl-2-[[(7S)-7-methyl-4-oxo-3-(2-phenylethyl)-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanyl]acetamide —— C27H33N3O4S3
N-[(3S)-1,1-dioxothiolan-3-yl]-N-ethyl-2-[[(7S)-7-methyl-4-oxo-3-(2-phenylethyl)-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanyl]acetamide
—— N-(2,5-dimethylphenyl)-2-[[(7R)-3-(2-methoxyphenyl)-7-(2-methylbutan-2-yl)-4-oxo-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanyl]acetamide —— C32H37N3O3S2
N-(2,5-dimethylphenyl)-2-[[(7R)-3-(2-methoxyphenyl)-7-(2-methylbutan-2-yl)-4-oxo-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanyl]acetamide
—— 2-[(5-chloro-2-methoxyphenyl)methylsulfanylmethyl]-5,6,7,8-tetrahydro-3H-[1]benzothiolo[2,3-d]pyrimidin-4-one —— C19H19ClN2O2S2
2-[(5-chloro-2-methoxyphenyl)methylsulfanylmethyl]-5,6,7,8-tetrahydro-3H-[1]benzothiolo[2,3-d]pyrimidin-4-one
—— (7S)-2-[(1S)-1-(furan-2-ylmethylsulfanyl)ethyl]-7-methyl-5,6,7,8-tetrahydro-3H-[1]benzothiolo[2,3-d]pyrimidin-4-one —— C18H20N2O2S2
(7S)-2-[(1S)-1-(furan-2-ylmethylsulfanyl)ethyl]-7-methyl-5,6,7,8-tetrahydro-3H-[1]benzothiolo[2,3-d]pyrimidin-4-one
—— N-(3-fluoro-4-methylphenyl)-2-[[(7S)-3-(2-methoxyphenyl)-7-(2-methylbutan-2-yl)-4-oxo-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanyl]acetamide —— C31H34FN3O3S2
N-(3-fluoro-4-methylphenyl)-2-[[(7S)-3-(2-methoxyphenyl)-7-(2-methylbutan-2-yl)-4-oxo-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanyl]acetamide
—— 2-[[(7R)-7-methyl-3-(2-methylphenyl)-4-oxo-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanyl]-N-(4-methyl-2-nitrophenyl)acetamide —— C27H26N4O4S2
2-[[(7R)-7-methyl-3-(2-methylphenyl)-4-oxo-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanyl]-N-(4-methyl-2-nitrophenyl)acetamide
—— N-(2,5-dimethylphenyl)-2-[[(7S)-3-(2-methoxyphenyl)-7-(2-methylbutan-2-yl)-4-oxo-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanyl]acetamide —— C32H37N3O3S2
N-(2,5-dimethylphenyl)-2-[[(7S)-3-(2-methoxyphenyl)-7-(2-methylbutan-2-yl)-4-oxo-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanyl]acetamide
—— ethyl (4S)-4-methyl-6-[[(7S)-7-(2-methylbutan-2-yl)-4-oxo-3-propyl-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanylmethyl]-2-oxo-3,4-dihydro-1H-pyrimidine-5-carboxylate —— C27H38N4O4S2
ethyl (4S)-4-methyl-6-[[(7S)-7-(2-methylbutan-2-yl)-4-oxo-3-propyl-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanylmethyl]-2-oxo-3,4-dihydro-1H-pyrimidine-5-carboxylate
—— ethyl (4R)-4-methyl-6-[[(7S)-7-(2-methylbutan-2-yl)-4-oxo-3-propyl-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanylmethyl]-2-oxo-3,4-dihydro-1H-pyrimidine-5-carboxylate —— C27H38N4O4S2
ethyl (4R)-4-methyl-6-[[(7S)-7-(2-methylbutan-2-yl)-4-oxo-3-propyl-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanylmethyl]-2-oxo-3,4-dihydro-1H-pyrimidine-5-carboxylate
—— 2-[(2R)-2-hydroxy-3-(3-methylphenoxy)propyl]sulfanyl-5,6,7,8-tetrahydro-3H-[1]benzothiolo[2,3-d]pyrimidin-4-one —— C20H22N2O3S2
2-[(2R)-2-hydroxy-3-(3-methylphenoxy)propyl]sulfanyl-5,6,7,8-tetrahydro-3H-[1]benzothiolo[2,3-d]pyrimidin-4-one
—— 2-[[4-[2-[(1S)-cyclopent-2-en-1-yl]acetyl]piperazin-1-yl]methyl]-5,6-dimethyl-3H-thieno[2,3-d]pyrimidin-4-one —— C20H26N4O2S
2-[[4-[2-[(1S)-cyclopent-2-en-1-yl]acetyl]piperazin-1-yl]methyl]-5,6-dimethyl-3H-thieno[2,3-d]pyrimidin-4-one
—— ethyl (4R)-4-methyl-6-[[(7R)-7-(2-methylbutan-2-yl)-4-oxo-3-propyl-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanylmethyl]-2-oxo-3,4-dihydro-1H-pyrimidine-5-carboxylate —— C27H38N4O4S2
ethyl (4R)-4-methyl-6-[[(7R)-7-(2-methylbutan-2-yl)-4-oxo-3-propyl-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanylmethyl]-2-oxo-3,4-dihydro-1H-pyrimidine-5-carboxylate
—— 3-(3,4-Dimethylphenyl)-5-ethyl-2-(2-hydroxyethylsulfanyl)-6-methylthieno[2,3-d]pyrimidin-4-one —— C19H22N2O2S2
3-(3,4-Dimethylphenyl)-5-ethyl-2-(2-hydroxyethylsulfanyl)-6-methylthieno[2,3-d]pyrimidin-4-one
—— ethyl (4S)-4-methyl-6-[[(7R)-7-(2-methylbutan-2-yl)-4-oxo-3-propyl-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanylmethyl]-2-oxo-3,4-dihydro-1H-pyrimidine-5-carboxylate —— C27H38N4O4S2
ethyl (4S)-4-methyl-6-[[(7R)-7-(2-methylbutan-2-yl)-4-oxo-3-propyl-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanylmethyl]-2-oxo-3,4-dihydro-1H-pyrimidine-5-carboxylate
—— N-(2-chloro-4-nitrophenyl)-2-[[(7R)-3-(4-chlorophenyl)-7-methyl-4-oxo-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanyl]acetamide —— C25H20Cl2N4O4S2
N-(2-chloro-4-nitrophenyl)-2-[[(7R)-3-(4-chlorophenyl)-7-methyl-4-oxo-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl]sulfanyl]acetamide
—— (7R)-2-(2-hydroxyethylsulfanyl)-7-methyl-3-prop-2-enyl-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-4-one —— C16H20N2O2S2
(7R)-2-(2-hydroxyethylsulfanyl)-7-methyl-3-prop-2-enyl-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-4-one
—— 2-(2-Hydroxyethylsulfanyl)-6-phenyl-3-prop-2-enylthieno[3,2-d]pyrimidin-4-one —— C17H16N2O2S2
2-(2-Hydroxyethylsulfanyl)-6-phenyl-3-prop-2-enylthieno[3,2-d]pyrimidin-4-one
—— (7R)-3-(2-fluorophenyl)-2-(2-hydroxyethylsulfanyl)-7-methyl-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-4-one —— C19H19FN2O2S2
(7R)-3-(2-fluorophenyl)-2-(2-hydroxyethylsulfanyl)-7-methyl-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-4-one
—— 3-(2,5-Dimethylphenyl)-2-(2-hydroxyethylsulfanyl)-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-4-one —— C20H22N2O2S2
3-(2,5-Dimethylphenyl)-2-(2-hydroxyethylsulfanyl)-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-4-one
—— 2-(2-Hydroxyethylsulfanyl)-5-(4-methylphenyl)-3-prop-2-enylthieno[2,3-d]pyrimidin-4-one —— C18H18N2O2S2
2-(2-Hydroxyethylsulfanyl)-5-(4-methylphenyl)-3-prop-2-enylthieno[2,3-d]pyrimidin-4-one
—— 6-acetyl-2-(1-adamantylsulfanylmethyl)-5-methyl-3H-thieno[2,3-d]pyrimidin-4-one —— C20H24N2O2S2
6-acetyl-2-(1-adamantylsulfanylmethyl)-5-methyl-3H-thieno[2,3-d]pyrimidin-4-one
—— (1-propyltetrazol-5-yl)methyl 3-[(7S)-7-methyl-4-oxo-5,6,7,8-tetrahydro-3H-[1]benzothiolo[2,3-d]pyrimidin-2-yl]propanoate —— C19H24N6O3S
(1-propyltetrazol-5-yl)methyl 3-[(7S)-7-methyl-4-oxo-5,6,7,8-tetrahydro-3H-[1]benzothiolo[2,3-d]pyrimidin-2-yl]propanoate
—— N-[(1R)-1-cyclopropylethyl]-2-[[5-(4-fluorophenyl)-6-methyl-4-oxo-3H-thieno[2,3-d]pyrimidin-2-yl]sulfanyl]acetamide —— C20H20FN3O2S2
N-[(1R)-1-cyclopropylethyl]-2-[[5-(4-fluorophenyl)-6-methyl-4-oxo-3H-thieno[2,3-d]pyrimidin-2-yl]sulfanyl]acetamide
—— [2-[[(1S)-1-cyclopropylethyl]amino]-2-oxoethyl] 3-[(7R)-7-methyl-4-oxo-5,6,7,8-tetrahydro-3H-[1]benzothiolo[2,3-d]pyrimidin-2-yl]propanoate —— C21H27N3O4S
[2-[[(1S)-1-cyclopropylethyl]amino]-2-oxoethyl] 3-[(7R)-7-methyl-4-oxo-5,6,7,8-tetrahydro-3H-[1]benzothiolo[2,3-d]pyrimidin-2-yl]propanoate
—— N-[(1S)-1-cyclopropylethyl]-2-[[5-(4-fluorophenyl)-6-methyl-4-oxo-3H-thieno[2,3-d]pyrimidin-2-yl]sulfanyl]acetamide —— C20H20FN3O2S2
N-[(1S)-1-cyclopropylethyl]-2-[[5-(4-fluorophenyl)-6-methyl-4-oxo-3H-thieno[2,3-d]pyrimidin-2-yl]sulfanyl]acetamide
—— [(1R)-1-(5,6-dimethyl-4-oxo-3H-thieno[2,3-d]pyrimidin-2-yl)ethyl] 2-(5-chloro-2-methoxyphenyl)acetate —— C19H19ClN2O4S
[(1R)-1-(5,6-dimethyl-4-oxo-3H-thieno[2,3-d]pyrimidin-2-yl)ethyl] 2-(5-chloro-2-methoxyphenyl)acetate
—— 2-[[5-(ethylamino)-1,3,4-thiadiazol-2-yl]sulfanylmethyl]-5,6-dimethyl-3H-thieno[2,3-d]pyrimidin-4-one —— C13H15N5OS3
2-[[5-(ethylamino)-1,3,4-thiadiazol-2-yl]sulfanylmethyl]-5,6-dimethyl-3H-thieno[2,3-d]pyrimidin-4-one
—— methyl 2-methyl-5-[2-[2-(4-methylpiperidin-1-yl)-2-oxoethoxy]-2-oxoethyl]-4-oxo-3H-thieno[2,3-d]pyrimidine-6-carboxylate —— C19H23N3O6S
methyl 2-methyl-5-[2-[2-(4-methylpiperidin-1-yl)-2-oxoethoxy]-2-oxoethyl]-4-oxo-3H-thieno[2,3-d]pyrimidine-6-carboxylate
—— [(1S)-1-(5,6-dimethyl-4-oxo-3H-thieno[2,3-d]pyrimidin-2-yl)ethyl] 5-chloro-1-benzofuran-2-carboxylate —— C19H15ClN2O4S
[(1S)-1-(5,6-dimethyl-4-oxo-3H-thieno[2,3-d]pyrimidin-2-yl)ethyl] 5-chloro-1-benzofuran-2-carboxylate
—— 6-acetyl-2-[[5-(ethylamino)-1,3,4-thiadiazol-2-yl]sulfanylmethyl]-5-methyl-3H-thieno[2,3-d]pyrimidin-4-one —— C14H15N5O2S3
6-acetyl-2-[[5-(ethylamino)-1,3,4-thiadiazol-2-yl]sulfanylmethyl]-5-methyl-3H-thieno[2,3-d]pyrimidin-4-one
—— methyl 5-[2-[2-[[(1R)-1-cyclopropylethyl]amino]-2-oxoethoxy]-2-oxoethyl]-2-methyl-4-oxo-3H-thieno[2,3-d]pyrimidine-6-carboxylate —— C18H21N3O6S
methyl 5-[2-[2-[[(1R)-1-cyclopropylethyl]amino]-2-oxoethoxy]-2-oxoethyl]-2-methyl-4-oxo-3H-thieno[2,3-d]pyrimidine-6-carboxylate
—— methyl 5-[2-(3,3-dimethyl-2-oxobutoxy)-2-oxoethyl]-2-methyl-4-oxo-3H-thieno[2,3-d]pyrimidine-6-carboxylate —— C17H20N2O6S
methyl 5-[2-(3,3-dimethyl-2-oxobutoxy)-2-oxoethyl]-2-methyl-4-oxo-3H-thieno[2,3-d]pyrimidine-6-carboxylate
—— 5,6-dimethyl-2-[(1R)-1-[[5-(2-methylpropylamino)-1,3,4-thiadiazol-2-yl]sulfanyl]ethyl]-3H-thieno[2,3-d]pyrimidin-4-one —— C16H21N5OS3
5,6-dimethyl-2-[(1R)-1-[[5-(2-methylpropylamino)-1,3,4-thiadiazol-2-yl]sulfanyl]ethyl]-3H-thieno[2,3-d]pyrimidin-4-one
—— methyl 2-methyl-4-oxo-5-[2-oxo-2-(2-oxo-2-pyrrolidin-1-ylethoxy)ethyl]-3H-thieno[2,3-d]pyrimidine-6-carboxylate —— C17H19N3O6S
methyl 2-methyl-4-oxo-5-[2-oxo-2-(2-oxo-2-pyrrolidin-1-ylethoxy)ethyl]-3H-thieno[2,3-d]pyrimidine-6-carboxylate
—— methyl 2-methyl-5-[2-[2-(2-methylpropylamino)-2-oxoethoxy]-2-oxoethyl]-4-oxo-3H-thieno[2,3-d]pyrimidine-6-carboxylate —— C17H21N3O6S
methyl 2-methyl-5-[2-[2-(2-methylpropylamino)-2-oxoethoxy]-2-oxoethyl]-4-oxo-3H-thieno[2,3-d]pyrimidine-6-carboxylate
—— 5-(4-Oxothieno[2,3-d]pyrimidin-3-yl)pentanenitrile —— C11H11N3OS
5-(4-Oxothieno[2,3-d]pyrimidin-3-yl)pentanenitrile
—— 3-[[4-Amino-6-(4-methylanilino)-1,3,5-triazin-2-yl]methyl]thieno[2,3-d]pyrimidin-4-one —— C17H15N7OS
3-[[4-Amino-6-(4-methylanilino)-1,3,5-triazin-2-yl]methyl]thieno[2,3-d]pyrimidin-4-one
—— 3-[[(1R)-2,2-dichlorocyclopropyl]methyl]thieno[2,3-d]pyrimidin-4-one —— C10H8Cl2N2OS
3-[[(1R)-2,2-dichlorocyclopropyl]methyl]thieno[2,3-d]pyrimidin-4-one