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    首页 分子通 按分子结构分类 有机化合物 有机杂环化合物 噻吩并嘧啶酮衍生物

    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
    —— 4-[1-[2-[(2S)-2-ethylpiperidin-1-yl]-2-oxoethyl]-2,4-dioxothieno[3,2-d]pyrimidin-3-yl]-N-(4-methoxyphenyl)butanamide —— C26H32N4O5S
    4-[1-[2-[(2S)-2-ethylpiperidin-1-yl]-2-oxoethyl]-2,4-dioxothieno[3,2-d]pyrimidin-3-yl]-N-(4-methoxyphenyl)butanamide
    —— 3-(4-chlorophenyl)-1-[2-[(3S,5R)-3,5-dimethylpiperidin-1-yl]-2-oxoethyl]-5,6-dimethylthieno[2,3-d]pyrimidine-2,4-dione —— C23H26ClN3O3S
    3-(4-chlorophenyl)-1-[2-[(3S,5R)-3,5-dimethylpiperidin-1-yl]-2-oxoethyl]-5,6-dimethylthieno[2,3-d]pyrimidine-2,4-dione
    —— N-(1,3-benzodioxol-5-yl)-2-[5-[(3S,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide —— C23H26N4O6S2
    N-(1,3-benzodioxol-5-yl)-2-[5-[(3S,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide
    —— N-(2,4-difluorophenyl)-2-[5-[(3S,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide —— C22H24F2N4O4S2
    N-(2,4-difluorophenyl)-2-[5-[(3S,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide
    —— 2-[5-[(3S,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-[[(2S)-oxolan-2-yl]methyl]acetamide —— C21H30N4O5S2
    2-[5-[(3S,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-[[(2S)-oxolan-2-yl]methyl]acetamide
    —— 2-[5-[(3R,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-(3-methoxyphenyl)acetamide —— C23H28N4O5S2
    2-[5-[(3R,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-(3-methoxyphenyl)acetamide
    —— 2-[5-[(3S,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-(4-propan-2-ylphenyl)acetamide —— C25H32N4O4S2
    2-[5-[(3S,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-(4-propan-2-ylphenyl)acetamide
    —— N-[(1R,2S,3R)-2,3-dimethylcyclohexyl]-2-[5-[(3S,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide —— C24H36N4O4S2
    N-[(1R,2S,3R)-2,3-dimethylcyclohexyl]-2-[5-[(3S,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide
    —— 2-[5-[(3R,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-(4-ethylphenyl)acetamide —— C24H30N4O4S2
    2-[5-[(3R,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-(4-ethylphenyl)acetamide
    —— N-benzyl-2-[5-[(3S,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-methylacetamide —— C24H30N4O4S2
    N-benzyl-2-[5-[(3S,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-methylacetamide
    —— N-[(2S)-butan-2-yl]-2-[5-[(3S,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide —— C20H30N4O4S2
    N-[(2S)-butan-2-yl]-2-[5-[(3S,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide
    —— 2-[5-[(3R,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-[(2-methoxyphenyl)methyl]acetamide —— C24H30N4O5S2
    2-[5-[(3R,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-[(2-methoxyphenyl)methyl]acetamide
    —— 3-ethyl-6-phenyl-2-sulfanyl-3H,4H-thieno[2,3-d]pyrimidin-4-one —— C14H12N2OS2
    3-ethyl-6-phenyl-2-sulfanyl-3H,4H-thieno[2,3-d]pyrimidin-4-one
    —— N-cycloheptyl-2-[5-[(3R,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide —— C23H34N4O4S2
    N-cycloheptyl-2-[5-[(3R,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide
    —— N-[4-(diethylamino)phenyl]-2-{[3-(4-ethoxyphenyl)-4-oxo-3,4,5,6,7,8-hexahydro[1]benzothieno[2,3-d]pyrimidin-2-yl]sulfanyl}acetamide 618432-33-0 C30H34N4O3S2
    N-[4-(diethylamino)phenyl]-2-{[3-(4-ethoxyphenyl)-4-oxo-3,4,5,6,7,8-hexahydro[1]benzothieno[2,3-d]pyrimidin-2-yl]sulfanyl}acetamide
    —— 2-[5-[(3S,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-(4-ethylphenyl)acetamide —— C24H30N4O4S2
    2-[5-[(3S,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-(4-ethylphenyl)acetamide
    —— N-(2,4-difluorophenyl)-2-[5-[(3S,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide —— C22H24F2N4O4S2
    N-(2,4-difluorophenyl)-2-[5-[(3S,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide
    —— N-cyclohexyl-2-[5-[(3S,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide —— C22H32N4O4S2
    N-cyclohexyl-2-[5-[(3S,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide
    —— N-[2-(dimethylamino)ethyl]-2-[5-[(3R,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide —— C20H31N5O4S2
    N-[2-(dimethylamino)ethyl]-2-[5-[(3R,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide
    —— 2-[5-[(3R,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-(4-ethoxyphenyl)acetamide —— C24H30N4O5S2
    2-[5-[(3R,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-(4-ethoxyphenyl)acetamide
    —— 2-[5-[(3S,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-[(4-fluorophenyl)methyl]acetamide —— C23H27FN4O4S2
    2-[5-[(3S,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-[(4-fluorophenyl)methyl]acetamide
    —— 2-[(1R)-1-[3-(4-methoxyphenoxy)propylsulfanyl]ethyl]-5,6-dimethyl-3H-thieno[2,3-d]pyrimidin-4-one —— C20H24N2O3S2
    2-[(1R)-1-[3-(4-methoxyphenoxy)propylsulfanyl]ethyl]-5,6-dimethyl-3H-thieno[2,3-d]pyrimidin-4-one
    —— 2-[5-[(3S,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-(3-fluoro-4-methylphenyl)acetamide —— C23H27FN4O4S2
    2-[5-[(3S,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-(3-fluoro-4-methylphenyl)acetamide
    —— N-[2-(cyclohexen-1-yl)ethyl]-2-[5-[(3S,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide —— C24H34N4O4S2
    N-[2-(cyclohexen-1-yl)ethyl]-2-[5-[(3S,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide
    —— 2-[5-[(3S,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-(3-methoxyphenyl)acetamide —— C23H28N4O5S2
    2-[5-[(3S,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-(3-methoxyphenyl)acetamide
    —— N-(2,4-difluorophenyl)-2-[5-[(3R,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide —— C22H24F2N4O4S2
    N-(2,4-difluorophenyl)-2-[5-[(3R,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide
    —— N-[2-[butyl(ethyl)amino]ethyl]-2-[5-[(3S,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide —— C24H39N5O4S2
    N-[2-[butyl(ethyl)amino]ethyl]-2-[5-[(3S,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide
    —— 5-[(3R,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-3-(2-morpholin-4-yl-2-oxoethyl)thieno[2,3-d]pyrimidin-4-one —— C20H28N4O5S2
    5-[(3R,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-3-(2-morpholin-4-yl-2-oxoethyl)thieno[2,3-d]pyrimidin-4-one
    —— 5-[(3S,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-3-(2-morpholin-4-yl-2-oxoethyl)thieno[2,3-d]pyrimidin-4-one —— C20H28N4O5S2
    5-[(3S,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-3-(2-morpholin-4-yl-2-oxoethyl)thieno[2,3-d]pyrimidin-4-one
    —— 2-[5-[(3S,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-[[(2R)-oxolan-2-yl]methyl]acetamide —— C21H30N4O5S2
    2-[5-[(3S,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-[[(2R)-oxolan-2-yl]methyl]acetamide
    —— 2-[5-[(3R,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-(4-propan-2-ylphenyl)acetamide —— C25H32N4O4S2
    2-[5-[(3R,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-(4-propan-2-ylphenyl)acetamide
    —— 2-[5-[(3S,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-(3-methoxyphenyl)acetamide —— C23H28N4O5S2
    2-[5-[(3S,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-(3-methoxyphenyl)acetamide
    —— 2-[5-[(3S,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-[(4-fluorophenyl)methyl]acetamide —— C23H27FN4O4S2
    2-[5-[(3S,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-[(4-fluorophenyl)methyl]acetamide
    —— N-[(1S,2S,3S)-2,3-dimethylcyclohexyl]-2-[5-[(3S,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide —— C24H36N4O4S2
    N-[(1S,2S,3S)-2,3-dimethylcyclohexyl]-2-[5-[(3S,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide
    —— N-[3-(diethylamino)propyl]-2-[5-[(3R,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide —— C23H37N5O4S2
    N-[3-(diethylamino)propyl]-2-[5-[(3R,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide
    —— N-benzyl-2-[5-[(3R,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-methylacetamide —— C24H30N4O4S2
    N-benzyl-2-[5-[(3R,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-methylacetamide
    —— 2-[5-[(3R,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-[2-(dipropylamino)ethyl]acetamide —— C24H39N5O4S2
    2-[5-[(3R,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-[2-(dipropylamino)ethyl]acetamide
    —— 5-[(3S,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-3-(2-morpholin-4-yl-2-oxoethyl)thieno[2,3-d]pyrimidin-4-one —— C20H28N4O5S2
    5-[(3S,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-3-(2-morpholin-4-yl-2-oxoethyl)thieno[2,3-d]pyrimidin-4-one
    —— N-[2-(diethylamino)ethyl]-2-[5-[(3S,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide —— C22H35N5O4S2
    N-[2-(diethylamino)ethyl]-2-[5-[(3S,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide
    —— N-[(2R)-butan-2-yl]-2-[5-[(3S,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide —— C20H30N4O4S2
    N-[(2R)-butan-2-yl]-2-[5-[(3S,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide
    —— 2-[5-[(3R,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-[(4-fluorophenyl)methyl]acetamide —— C23H27FN4O4S2
    2-[5-[(3R,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-[(4-fluorophenyl)methyl]acetamide
    —— (7R)-7-methyl-2-[(1R)-1-[[5-(propan-2-ylamino)-1,3,4-thiadiazol-2-yl]sulfanyl]ethyl]-5,6,7,8-tetrahydro-3H-[1]benzothiolo[2,3-d]pyrimidin-4-one —— C18H23N5OS3
    (7R)-7-methyl-2-[(1R)-1-[[5-(propan-2-ylamino)-1,3,4-thiadiazol-2-yl]sulfanyl]ethyl]-5,6,7,8-tetrahydro-3H-[1]benzothiolo[2,3-d]pyrimidin-4-one
    —— N-[(1S)-1-(2-methoxy-5-methylphenyl)ethyl]-2-[(12-oxo-7-thia-9,11-diazatricyclo[6.4.0.02,6]dodeca-1(8),2(6),9-trien-10-yl)methylsulfanyl]acetamide —— C22H25N3O3S2
    N-[(1S)-1-(2-methoxy-5-methylphenyl)ethyl]-2-[(12-oxo-7-thia-9,11-diazatricyclo[6.4.0.02,6]dodeca-1(8),2(6),9-trien-10-yl)methylsulfanyl]acetamide
    —— 2-[5-[(3R,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-(3-fluoro-4-methylphenyl)acetamide —— C23H27FN4O4S2
    2-[5-[(3R,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-(3-fluoro-4-methylphenyl)acetamide
    —— N-[3-(azepan-1-yl)propyl]-2-[5-[(3S,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide —— C25H39N5O4S2
    N-[3-(azepan-1-yl)propyl]-2-[5-[(3S,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide
    —— 2-[5-[(3S,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-[(2-methoxyphenyl)methyl]acetamide —— C24H30N4O5S2
    2-[5-[(3S,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]-N-[(2-methoxyphenyl)methyl]acetamide
    —— N-cycloheptyl-2-[5-[(3S,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide —— C23H34N4O4S2
    N-cycloheptyl-2-[5-[(3S,5S)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide
    —— N-[2-[butyl(ethyl)amino]ethyl]-2-[5-[(3S,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide —— C24H39N5O4S2
    N-[2-[butyl(ethyl)amino]ethyl]-2-[5-[(3S,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide
    —— N-cycloheptyl-2-[5-[(3S,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide —— C23H34N4O4S2
    N-cycloheptyl-2-[5-[(3S,5R)-3,5-dimethylpiperidin-1-yl]sulfonyl-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide
    —— 5,6-dimethyl-2-[(1S)-1-(3-phenoxypropylsulfanyl)ethyl]-3H-thieno[2,3-d]pyrimidin-4-one —— C19H22N2O2S2
    5,6-dimethyl-2-[(1S)-1-(3-phenoxypropylsulfanyl)ethyl]-3H-thieno[2,3-d]pyrimidin-4-one