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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
    —— (14,14-Dimethyl-13-oxa-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaen-4-yl)methyl-(3-hydroxypropyl)azanium —— C16H22N5O2S+
    (14,14-Dimethyl-13-oxa-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaen-4-yl)methyl-(3-hydroxypropyl)azanium
    —— (14S)-4,7,14-trimethyl-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene —— C14H16N4S
    (14S)-4,7,14-trimethyl-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene
    —— N-butyl-N-ethyl-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene-4-carboxamide —— C18H23N5OS
    N-butyl-N-ethyl-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene-4-carboxamide
    —— N-(2-ethyl-5-oxo-4H-[1,2,4]triazolo[1,5-a]pyrimidin-7-yl)butanamide —— C11H15N5O2
    N-(2-ethyl-5-oxo-4H-[1,2,4]triazolo[1,5-a]pyrimidin-7-yl)butanamide
    —— 3-[(14,14-Dimethyl-13-oxa-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaen-4-yl)methylamino]propan-1-ol —— C16H21N5O2S
    3-[(14,14-Dimethyl-13-oxa-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaen-4-yl)methylamino]propan-1-ol
    —— (4-Ethylpiperazin-1-yl)-(7,14,14-trimethyl-13-oxa-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaen-4-yl)methanone —— C20H26N6O2S
    (4-Ethylpiperazin-1-yl)-(7,14,14-trimethyl-13-oxa-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaen-4-yl)methanone
    —— (14R)-4,7,14-trimethyl-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene —— C14H16N4S
    (14R)-4,7,14-trimethyl-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene
    —— (4-Ethylpiperazin-4-ium-1-yl)-(7,14,14-trimethyl-13-oxa-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaen-4-yl)methanone —— C20H27N6O2S+
    (4-Ethylpiperazin-4-ium-1-yl)-(7,14,14-trimethyl-13-oxa-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaen-4-yl)methanone
    —— Diethyl-[3-[(7,14,14-trimethyl-13-oxa-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene-4-carbonyl)amino]propyl]azanium —— C21H31N6O2S+
    Diethyl-[3-[(7,14,14-trimethyl-13-oxa-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene-4-carbonyl)amino]propyl]azanium
    —— (15R)-15-methyl-N-(3-morpholin-4-ium-4-ylpropyl)-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene-4-carboxamide —— C20H27N6O2S+
    (15R)-15-methyl-N-(3-morpholin-4-ium-4-ylpropyl)-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene-4-carboxamide
    —— (15S)-15-methyl-N-(3-morpholin-4-ylpropyl)-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene-4-carboxamide —— C20H26N6O2S
    (15S)-15-methyl-N-(3-morpholin-4-ylpropyl)-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene-4-carboxamide
    —— N-[3-(diethylamino)propyl]-5,10,10-trimethyl-10,11-dihydro-8H-pyrano[4',3':4,5]thieno[3,2-e][1,2,4]triazolo[1,5-c]pyrimidine-2-carboxamide —— C21H30N6O2S
    N-[3-(diethylamino)propyl]-5,10,10-trimethyl-10,11-dihydro-8H-pyrano[4',3':4,5]thieno[3,2-e][1,2,4]triazolo[1,5-c]pyrimidine-2-carboxamide
    —— Methyl {2-[(2,6-dichlorobenzyl)amino]-7-hydroxy-5-methyl[1,2,4]triazolo[1,5-a]pyrimidin-6-yl}acetate —— C16H15Cl2N5O3
    Methyl {2-[(2,6-dichlorobenzyl)amino]-7-hydroxy-5-methyl[1,2,4]triazolo[1,5-a]pyrimidin-6-yl}acetate
    —— (15S)-15-methyl-N-(3-morpholin-4-ium-4-ylpropyl)-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene-4-carboxamide —— C20H27N6O2S+
    (15S)-15-methyl-N-(3-morpholin-4-ium-4-ylpropyl)-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene-4-carboxamide
    —— ethyl (5E,6R,7S)-7-(4-ethoxyphenyl)-5-propylidene-6,7-dihydro-4H-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C19H24N4O3
    ethyl (5E,6R,7S)-7-(4-ethoxyphenyl)-5-propylidene-6,7-dihydro-4H-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— (15S)-15-methyl-N-(2-methylpropyl)-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene-4-carboxamide —— C17H21N5OS
    (15S)-15-methyl-N-(2-methylpropyl)-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene-4-carboxamide
    —— (15R)-15-methyl-N-(2-methylpropyl)-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene-4-carboxamide —— C17H21N5OS
    (15R)-15-methyl-N-(2-methylpropyl)-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene-4-carboxamide
    —— methyl 2-[5-methyl-7-oxo-2-(2-phenylethyl)-1H-[1,2,4]triazolo[1,5-a]pyrimidin-6-yl]acetate —— C17H18N4O3
    methyl 2-[5-methyl-7-oxo-2-(2-phenylethyl)-1H-[1,2,4]triazolo[1,5-a]pyrimidin-6-yl]acetate
    —— N-(2-butyl-5-oxo-4H-[1,2,4]triazolo[1,5-a]pyrimidin-7-yl)furan-2-carboxamide —— C14H15N5O3
    N-(2-butyl-5-oxo-4H-[1,2,4]triazolo[1,5-a]pyrimidin-7-yl)furan-2-carboxamide
    —— N-(furan-2-ylmethyl)-14,14-dimethyl-13-oxa-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene-4-carboxamide —— C18H17N5O3S
    N-(furan-2-ylmethyl)-14,14-dimethyl-13-oxa-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene-4-carboxamide
    —— Diethyl-[2-(10-thia-3,5,6,8-tetrazatetracyclo[7.6.0.02,6.011,15]pentadeca-1(9),2,4,7,11(15)-pentaene-4-carbonylamino)ethyl]azanium —— C17H23N6OS+
    Diethyl-[2-(10-thia-3,5,6,8-tetrazatetracyclo[7.6.0.02,6.011,15]pentadeca-1(9),2,4,7,11(15)-pentaene-4-carbonylamino)ethyl]azanium
    —— [(15R)-7,15-dimethyl-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaen-4-yl]-morpholin-4-ylmethanone —— C18H21N5O2S
    [(15R)-7,15-dimethyl-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaen-4-yl]-morpholin-4-ylmethanone
    —— N-[(2S)-2-hydroxypropyl]-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene-4-carboxamide —— C15H17N5O2S
    N-[(2S)-2-hydroxypropyl]-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene-4-carboxamide
    —— N-[2-(diethylamino)ethyl]-10-thia-3,5,6,8-tetrazatetracyclo[7.6.0.02,6.011,15]pentadeca-1(9),2,4,7,11(15)-pentaene-4-carboxamide —— C17H22N6OS
    N-[2-(diethylamino)ethyl]-10-thia-3,5,6,8-tetrazatetracyclo[7.6.0.02,6.011,15]pentadeca-1(9),2,4,7,11(15)-pentaene-4-carboxamide
    —— (4-Methylpiperidin-1-yl)-(7-methyl-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaen-4-yl)methanone —— C19H23N5OS
    (4-Methylpiperidin-1-yl)-(7-methyl-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaen-4-yl)methanone
    —— ethyl (7S)-7-(4-ethoxyphenyl)-5-propyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C19H24N4O3
    ethyl (7S)-7-(4-ethoxyphenyl)-5-propyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
    —— Methyl {2-[(2-methoxybenzyl)amino]-5-methyl-7-oxo-3,7-dihydro[1,2,4]triazolo[1,5-a]pyrimidin-6-yl}acetate —— C17H19N5O4
    Methyl {2-[(2-methoxybenzyl)amino]-5-methyl-7-oxo-3,7-dihydro[1,2,4]triazolo[1,5-a]pyrimidin-6-yl}acetate
    —— 2-[(3-chlorobenzyl)amino]-5,6-dimethyl[1,2,4]triazolo[1,5-a]pyrimidin-7(4H)-one —— C14H14ClN5O
    2-[(3-chlorobenzyl)amino]-5,6-dimethyl[1,2,4]triazolo[1,5-a]pyrimidin-7(4H)-one
    —— N-benzyl-10-thia-3,5,6,8-tetrazatetracyclo[7.6.0.02,6.011,15]pentadeca-1(9),2,4,7,11(15)-pentaene-4-carboxamide —— C18H15N5OS
    N-benzyl-10-thia-3,5,6,8-tetrazatetracyclo[7.6.0.02,6.011,15]pentadeca-1(9),2,4,7,11(15)-pentaene-4-carboxamide
    —— 7,13-Dibenzyl-3-methyl-16-thia-2,4,5,7-tetraza-13-azoniatetracyclo[7.7.0.02,6.010,15]hexadeca-1(9),3,5,10(15)-tetraen-8-one —— C25H24N5OS+
    7,13-Dibenzyl-3-methyl-16-thia-2,4,5,7-tetraza-13-azoniatetracyclo[7.7.0.02,6.010,15]hexadeca-1(9),3,5,10(15)-tetraen-8-one
    —— (14R)-4-ethyl-7,14-dimethyl-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene —— C15H18N4S
    (14R)-4-ethyl-7,14-dimethyl-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene
    —— (14S)-4-ethyl-7,14-dimethyl-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene —— C15H18N4S
    (14S)-4-ethyl-7,14-dimethyl-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene
    —— (14R)-N,N-bis[(2S)-2-hydroxypropyl]-14-methyl-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene-4-carboxamide —— C19H25N5O3S
    (14R)-N,N-bis[(2S)-2-hydroxypropyl]-14-methyl-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene-4-carboxamide
    —— N-[(14,14-dimethyl-13-oxa-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaen-4-yl)methyl]-1-[(2R)-oxolan-2-yl]methanamine —— C18H23N5O2S
    N-[(14,14-dimethyl-13-oxa-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaen-4-yl)methyl]-1-[(2R)-oxolan-2-yl]methanamine
    —— (15R)-N-[(2R)-1-hydroxybutan-2-yl]-7,15-dimethyl-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene-4-carboxamide —— C18H23N5O2S
    (15R)-N-[(2R)-1-hydroxybutan-2-yl]-7,15-dimethyl-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene-4-carboxamide
    —— N-[(14,14-dimethyl-13-oxa-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaen-4-yl)methyl]-1-[(2S)-oxolan-2-yl]methanamine —— C18H23N5O2S
    N-[(14,14-dimethyl-13-oxa-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaen-4-yl)methyl]-1-[(2S)-oxolan-2-yl]methanamine
    —— [(13R)-13-tert-butyl-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaen-4-yl]-(4-ethylpiperazin-4-ium-1-yl)methanone —— C22H31N6OS+
    [(13R)-13-tert-butyl-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaen-4-yl]-(4-ethylpiperazin-4-ium-1-yl)methanone
    —— (15S)-N-[(2R)-1-hydroxybutan-2-yl]-7,15-dimethyl-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene-4-carboxamide —— C18H23N5O2S
    (15S)-N-[(2R)-1-hydroxybutan-2-yl]-7,15-dimethyl-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene-4-carboxamide
    —— 6-chloro-2-[(4-fluorobenzyl)amino]-5-methyl[1,2,4]triazolo[1,5-a]pyrimidin-7(3H)-one —— C13H11ClFN5O
    6-chloro-2-[(4-fluorobenzyl)amino]-5-methyl[1,2,4]triazolo[1,5-a]pyrimidin-7(3H)-one
    —— [(13S)-13-tert-butyl-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaen-4-yl]-(4-ethylpiperazin-4-ium-1-yl)methanone —— C22H31N6OS+
    [(13S)-13-tert-butyl-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaen-4-yl]-(4-ethylpiperazin-4-ium-1-yl)methanone
    —— (14,14-dimethyl-13-oxa-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaen-4-yl)methyl-[[(2S)-oxolan-2-yl]methyl]azanium —— C18H24N5O2S+
    (14,14-dimethyl-13-oxa-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaen-4-yl)methyl-[[(2S)-oxolan-2-yl]methyl]azanium
    —— [(13R)-13-tert-butyl-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaen-4-yl]-(4-ethylpiperazin-1-yl)methanone —— C22H30N6OS
    [(13R)-13-tert-butyl-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaen-4-yl]-(4-ethylpiperazin-1-yl)methanone
    —— (15R)-N-[(2S)-1-hydroxybutan-2-yl]-7,15-dimethyl-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene-4-carboxamide —— C18H23N5O2S
    (15R)-N-[(2S)-1-hydroxybutan-2-yl]-7,15-dimethyl-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene-4-carboxamide
    —— (14,14-dimethyl-13-oxa-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaen-4-yl)methyl-[[(2R)-oxolan-2-yl]methyl]azanium —— C18H24N5O2S+
    (14,14-dimethyl-13-oxa-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaen-4-yl)methyl-[[(2R)-oxolan-2-yl]methyl]azanium
    —— (6S,7S)-7-(5-methylfuran-2-yl)-5-methylidene-N-phenyl-6,7-dihydro-1H-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxamide —— C18H17N5O2
    (6S,7S)-7-(5-methylfuran-2-yl)-5-methylidene-N-phenyl-6,7-dihydro-1H-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxamide
    —— 3-[(14,14-Dimethyl-13-oxa-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene-4-carbonyl)amino]propyl-dimethylazanium —— C18H25N6O2S+
    3-[(14,14-Dimethyl-13-oxa-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene-4-carbonyl)amino]propyl-dimethylazanium
    —— (15S)-N-[(2S)-1-hydroxybutan-2-yl]-7,15-dimethyl-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene-4-carboxamide —— C18H23N5O2S
    (15S)-N-[(2S)-1-hydroxybutan-2-yl]-7,15-dimethyl-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene-4-carboxamide
    —— N-cyclohexyl-5-methyl-9,10-dihydro-8H-cyclopenta[4,5]thieno[3,2-e][1,2,4]triazolo[1,5-c]pyrimidine-2-carboxamide —— C18H21N5OS
    N-cyclohexyl-5-methyl-9,10-dihydro-8H-cyclopenta[4,5]thieno[3,2-e][1,2,4]triazolo[1,5-c]pyrimidine-2-carboxamide
    —— N-[3-(dimethylamino)propyl]-10,10-dimethyl-10,11-dihydro-8H-pyrano[4',3':4,5]thieno[3,2-e][1,2,4]triazolo[1,5-c]pyrimidine-2-carboxamide —— C18H24N6O2S
    N-[3-(dimethylamino)propyl]-10,10-dimethyl-10,11-dihydro-8H-pyrano[4',3':4,5]thieno[3,2-e][1,2,4]triazolo[1,5-c]pyrimidine-2-carboxamide
    —— 3-(butylsulfanyl)-5-phenyl-9,10-dihydro-8H-cyclopenta[4,5]thieno[3,2-e][1,2,4]triazolo[4,3-c]pyrimidine —— C20H20N4S2
    3-(butylsulfanyl)-5-phenyl-9,10-dihydro-8H-cyclopenta[4,5]thieno[3,2-e][1,2,4]triazolo[4,3-c]pyrimidine