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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 三唑并嘧啶类

    三唑并嘧啶类

    中文名称 英文名称 CAS号 化学式 结构式图片
    —— butyl (7S)-7-[4-(dimethylamino)phenyl]-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C26H30FN5O2S
    butyl (7S)-7-[4-(dimethylamino)phenyl]-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— cyclohexyl (7S)-7-(4-chlorophenyl)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C26H26ClFN4O2S
    cyclohexyl (7S)-7-(4-chlorophenyl)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— cyclohexyl (7S)-7-[4-[(4-tert-butylphenyl)methoxy]-3-methoxyphenyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C31H38N4O4
    cyclohexyl (7S)-7-[4-[(4-tert-butylphenyl)methoxy]-3-methoxyphenyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— cyclohexyl (7R)-7-[3-methoxy-4-(2-oxo-2-piperidin-1-ylethoxy)phenyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C27H35N5O5
    cyclohexyl (7R)-7-[3-methoxy-4-(2-oxo-2-piperidin-1-ylethoxy)phenyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— cyclohexyl (7R)-7-[3-ethoxy-4-(2-oxo-2-piperidin-1-ylethoxy)phenyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C28H37N5O5
    cyclohexyl (7R)-7-[3-ethoxy-4-(2-oxo-2-piperidin-1-ylethoxy)phenyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— prop-2-enyl (7R)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-7-[4-(3-methylbutoxy)phenyl]-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C28H31FN4O3S
    prop-2-enyl (7R)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-7-[4-(3-methylbutoxy)phenyl]-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— cyclohexyl (7S)-5-methyl-7-[3-[(2-methylphenyl)methoxy]phenyl]-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C27H30N4O3
    cyclohexyl (7S)-5-methyl-7-[3-[(2-methylphenyl)methoxy]phenyl]-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— butyl (7S)-2-benzylsulfanyl-7-(4-methoxyphenyl)-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C25H28N4O3S
    butyl (7S)-2-benzylsulfanyl-7-(4-methoxyphenyl)-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— ethyl (7S)-7-(4-tert-butylphenyl)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C26H29FN4O2S
    ethyl (7S)-7-(4-tert-butylphenyl)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— propan-2-yl (7R)-2-benzylsulfanyl-7-(4-butoxyphenyl)-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C27H32N4O3S
    propan-2-yl (7R)-2-benzylsulfanyl-7-(4-butoxyphenyl)-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— methyl (7S)-2-[(2-fluorophenyl)methylsulfanyl]-7-(4-hydroxyphenyl)-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C21H19FN4O3S
    methyl (7S)-2-[(2-fluorophenyl)methylsulfanyl]-7-(4-hydroxyphenyl)-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— cyclohexyl (7R)-7-(3-ethoxy-4-pentoxyphenyl)-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C26H36N4O4
    cyclohexyl (7R)-7-(3-ethoxy-4-pentoxyphenyl)-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— 1-[(7S)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-7-[4-(2-phenylethoxy)phenyl]-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidin-6-yl]ethanone —— C29H27FN4O2S
    1-[(7S)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-7-[4-(2-phenylethoxy)phenyl]-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidin-6-yl]ethanone
    —— 1-[(7S)-7-(4-chlorophenyl)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidin-6-yl]ethanone —— C21H18ClFN4OS
    1-[(7S)-7-(4-chlorophenyl)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidin-6-yl]ethanone
    —— cyclohexyl (7S)-7-(2-ethoxyphenyl)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C28H31FN4O3S
    cyclohexyl (7S)-7-(2-ethoxyphenyl)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— 1-[(7R)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-7-[4-(2-phenylethoxy)phenyl]-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidin-6-yl]ethanone —— C29H27FN4O2S
    1-[(7R)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-7-[4-(2-phenylethoxy)phenyl]-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidin-6-yl]ethanone
    —— butyl (7S)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-7-(4-propoxyphenyl)-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C27H31FN4O3S
    butyl (7S)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-7-(4-propoxyphenyl)-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— 1-[(7R)-2-benzylsulfanyl-5-methyl-7-phenyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidin-6-yl]ethanone —— C21H20N4OS
    1-[(7R)-2-benzylsulfanyl-5-methyl-7-phenyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidin-6-yl]ethanone
    —— methyl (7S)-2-[(2-fluorophenyl)methylsulfanyl]-7-(4-hexoxyphenyl)-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C27H31FN4O3S
    methyl (7S)-2-[(2-fluorophenyl)methylsulfanyl]-7-(4-hexoxyphenyl)-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— ethyl (7R)-7-(4-ethoxyphenyl)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C24H25FN4O3S
    ethyl (7R)-7-(4-ethoxyphenyl)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— cyclohexyl (7S)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-7-[(E)-2-phenylethenyl]-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C28H29FN4O2S
    cyclohexyl (7S)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-7-[(E)-2-phenylethenyl]-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— cyclohexyl (7R)-2-[(2-chlorophenyl)methylsulfanyl]-5-methyl-7-(3-methylthiophen-2-yl)-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C25H27ClN4O2S2
    cyclohexyl (7R)-2-[(2-chlorophenyl)methylsulfanyl]-5-methyl-7-(3-methylthiophen-2-yl)-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— cyclohexyl (7S)-7-[3-ethoxy-4-[(2,4,5-trimethylphenyl)methoxy]phenyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C31H38N4O4
    cyclohexyl (7S)-7-[3-ethoxy-4-[(2,4,5-trimethylphenyl)methoxy]phenyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— methyl (7S)-7-(4-fluorophenyl)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C21H18F2N4O2S
    methyl (7S)-7-(4-fluorophenyl)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— propan-2-yl (7R)-7-[4-(dimethylamino)phenyl]-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C25H28FN5O2S
    propan-2-yl (7R)-7-[4-(dimethylamino)phenyl]-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— cyclohexyl (7R)-7-(3-chlorophenyl)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C26H26ClFN4O2S
    cyclohexyl (7R)-7-(3-chlorophenyl)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— cyclohexyl (7S)-7-(4-butoxyphenyl)-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C23H30N4O3
    cyclohexyl (7S)-7-(4-butoxyphenyl)-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— cyclohexyl (7R)-7-(2-ethoxyphenyl)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C28H31FN4O3S
    cyclohexyl (7R)-7-(2-ethoxyphenyl)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— cyclohexyl (7S)-2-[(2-chlorophenyl)methylsulfanyl]-7-(2-fluorophenyl)-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C26H26ClFN4O2S
    cyclohexyl (7S)-2-[(2-chlorophenyl)methylsulfanyl]-7-(2-fluorophenyl)-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— cyclohexyl (7S)-7-[4-[(4-chlorophenyl)methoxy]phenyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C26H27ClN4O3
    cyclohexyl (7S)-7-[4-[(4-chlorophenyl)methoxy]phenyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— cyclohexyl (7R)-7-(5-bromo-2-butoxyphenyl)-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C23H29BrN4O3
    cyclohexyl (7R)-7-(5-bromo-2-butoxyphenyl)-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— methyl (7S)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-7-(4-phenylmethoxyphenyl)-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C28H25FN4O3S
    methyl (7S)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-7-(4-phenylmethoxyphenyl)-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— cyclohexyl (7R)-2-[(2-chlorophenyl)methylsulfanyl]-7-(3-hydroxyphenyl)-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C26H27ClN4O3S
    cyclohexyl (7R)-2-[(2-chlorophenyl)methylsulfanyl]-7-(3-hydroxyphenyl)-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— butyl (7R)-2-benzylsulfanyl-7-(4-ethylphenyl)-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C26H30N4O2S
    butyl (7R)-2-benzylsulfanyl-7-(4-ethylphenyl)-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— cyclohexyl (7R)-2-[(2-chlorophenyl)methylsulfanyl]-7-(2-fluorophenyl)-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C26H26ClFN4O2S
    cyclohexyl (7R)-2-[(2-chlorophenyl)methylsulfanyl]-7-(2-fluorophenyl)-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— cyclohexyl (7S)-5-methyl-7-[4-[(4-methylphenyl)methoxy]phenyl]-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C27H30N4O3
    cyclohexyl (7S)-5-methyl-7-[4-[(4-methylphenyl)methoxy]phenyl]-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— cyclohexyl (7R)-7-(4-butoxy-3-methoxyphenyl)-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C24H32N4O4
    cyclohexyl (7R)-7-(4-butoxy-3-methoxyphenyl)-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— cyclohexyl (7S)-2-benzylsulfanyl-5-methyl-7-(4-propoxyphenyl)-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C29H34N4O3S
    cyclohexyl (7S)-2-benzylsulfanyl-5-methyl-7-(4-propoxyphenyl)-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— cyclohexyl (7R)-5-methyl-7-[4-[(2-methylphenyl)methoxy]phenyl]-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C27H30N4O3
    cyclohexyl (7R)-5-methyl-7-[4-[(2-methylphenyl)methoxy]phenyl]-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— (7S)-7-(4-ethylphenyl)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-N-(2-methylphenyl)-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxamide —— C29H28FN5OS
    (7S)-7-(4-ethylphenyl)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-N-(2-methylphenyl)-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxamide
    —— cyclohexyl (7R)-7-[3-methoxy-4-(2-morpholin-4-yl-2-oxoethoxy)phenyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C26H33N5O6
    cyclohexyl (7R)-7-[3-methoxy-4-(2-morpholin-4-yl-2-oxoethoxy)phenyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— propyl (7S)-7-[4-(dimethylamino)phenyl]-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C25H28FN5O2S
    propyl (7S)-7-[4-(dimethylamino)phenyl]-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— prop-2-enyl (7S)-7-(4-bromophenyl)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C23H20BrFN4O2S
    prop-2-enyl (7S)-7-(4-bromophenyl)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— prop-2-enyl (7S)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-7-phenyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C23H21FN4O2S
    prop-2-enyl (7S)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-7-phenyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— 1-[(7S)-2-[(2-fluorophenyl)methylsulfanyl]-7-(4-methoxyphenyl)-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidin-6-yl]ethanone —— C22H21FN4O2S
    1-[(7S)-2-[(2-fluorophenyl)methylsulfanyl]-7-(4-methoxyphenyl)-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidin-6-yl]ethanone
    —— methyl (7R)-7-(4-chlorophenyl)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C21H18ClFN4O2S
    methyl (7R)-7-(4-chlorophenyl)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— cyclohexyl (7S)-7-[4-[(2-chloro-6-fluorophenyl)methoxy]-3-methoxyphenyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C27H28ClFN4O4
    cyclohexyl (7S)-7-[4-[(2-chloro-6-fluorophenyl)methoxy]-3-methoxyphenyl]-5-methyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— cyclohexyl (7S)-5-methyl-7-(3-propoxyphenyl)-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C22H28N4O3
    cyclohexyl (7S)-5-methyl-7-(3-propoxyphenyl)-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— cyclohexyl (7R)-5-methyl-7-[3-[(4-methylphenyl)methoxy]phenyl]-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C27H30N4O3
    cyclohexyl (7R)-5-methyl-7-[3-[(4-methylphenyl)methoxy]phenyl]-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— propyl (7R)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-7-(4-nitrophenyl)-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C23H22FN5O4S
    propyl (7R)-2-[(2-fluorophenyl)methylsulfanyl]-5-methyl-7-(4-nitrophenyl)-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate