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三唑并嘧啶类

中文名称 英文名称 CAS号 化学式 结构式图片
—— (15S)-N-[(2S)-2-hydroxypropyl]-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 —— C17H21N5O2S
(15S)-N-[(2S)-2-hydroxypropyl]-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
—— 5-[[(7S)-7-(4-chlorophenyl)-5-oxo-6,7-dihydro-1H-[1,2,4]triazolo[1,5-a]pyrimidin-2-yl]amino]-5-oxopentanoate —— C16H15ClN5O4-
5-[[(7S)-7-(4-chlorophenyl)-5-oxo-6,7-dihydro-1H-[1,2,4]triazolo[1,5-a]pyrimidin-2-yl]amino]-5-oxopentanoate
—— 7-(3-Chlorophenyl)-3-(2,2-dimethoxyethylsulfanyl)-13-methyl-16-thia-2,4,5,7,13-pentazatetracyclo[7.7.0.02,6.010,15]hexadeca-1(9),3,5,10(15)-tetraen-8-one —— C21H22ClN5O3S2
7-(3-Chlorophenyl)-3-(2,2-dimethoxyethylsulfanyl)-13-methyl-16-thia-2,4,5,7,13-pentazatetracyclo[7.7.0.02,6.010,15]hexadeca-1(9),3,5,10(15)-tetraen-8-one
—— 7-methyl-N-(2-morpholin-4-ium-4-ylethyl)-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 —— C18H23N6O2S+
7-methyl-N-(2-morpholin-4-ium-4-ylethyl)-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
—— (6R,7S)-N-benzyl-5-methylidene-7-pyridin-2-yl-6,7-dihydro-1H-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxamide —— C19H18N6O
(6R,7S)-N-benzyl-5-methylidene-7-pyridin-2-yl-6,7-dihydro-1H-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxamide
—— (15S)-N,N-bis(2-methoxyethyl)-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 —— C20H27N5O3S
(15S)-N,N-bis(2-methoxyethyl)-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
—— cyclopropyl-[5-[(E)-2-(5,7-dimethyl-[1,2,4]triazolo[1,5-a]pyrimidin-2-yl)ethenyl]-1-methyl-1,2,4-triazol-3-yl]methanamine —— C16H20N8
cyclopropyl-[5-[(E)-2-(5,7-dimethyl-[1,2,4]triazolo[1,5-a]pyrimidin-2-yl)ethenyl]-1-methyl-1,2,4-triazol-3-yl]methanamine
—— (15R)-N,N-bis(2-methoxyethyl)-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 —— C20H27N5O3S
(15R)-N,N-bis(2-methoxyethyl)-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
—— Butyl-[(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]azanium —— C17H24N5OS+
Butyl-[(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]azanium
—— N-(2-butyl-5-oxo-4H-[1,2,4]triazolo[1,5-a]pyrimidin-7-yl)-3,4,5-trimethoxybenzamide —— C19H23N5O5
N-(2-butyl-5-oxo-4H-[1,2,4]triazolo[1,5-a]pyrimidin-7-yl)-3,4,5-trimethoxybenzamide
—— 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]butan-1-amine —— C17H23N5OS
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]butan-1-amine
—— [(2S)-2-ethylpiperidin-1-yl]-[(15S)-15-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 —— C20H25N5OS
[(2S)-2-ethylpiperidin-1-yl]-[(15S)-15-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
—— N-[(7R)-7-(4-chlorophenyl)-5-oxo-6,7-dihydro-1H-[1,2,4]triazolo[1,5-a]pyrimidin-2-yl]-3-phenylpropanamide —— C20H18ClN5O2
N-[(7R)-7-(4-chlorophenyl)-5-oxo-6,7-dihydro-1H-[1,2,4]triazolo[1,5-a]pyrimidin-2-yl]-3-phenylpropanamide
—— N-[(7S)-7-(4-chlorophenyl)-5-oxo-6,7-dihydro-1H-[1,2,4]triazolo[1,5-a]pyrimidin-2-yl]-3-phenylpropanamide —— C20H18ClN5O2
N-[(7S)-7-(4-chlorophenyl)-5-oxo-6,7-dihydro-1H-[1,2,4]triazolo[1,5-a]pyrimidin-2-yl]-3-phenylpropanamide
—— N-(2-hydroxyethyl)-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 —— C16H19N5O3S
N-(2-hydroxyethyl)-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
—— 3-methoxy-N-[(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)methyl]propan-1-amine —— C18H25N5O2S
3-methoxy-N-[(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)methyl]propan-1-amine
—— 3-Methoxypropyl-[(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)methyl]azanium —— C18H26N5O2S+
3-Methoxypropyl-[(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)methyl]azanium
—— Ethyl 4-[(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)methyl]piperazine-1-carboxylate —— C21H28N6O3S
Ethyl 4-[(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)methyl]piperazine-1-carboxylate
—— N-(pyridin-2-ylmethyl)-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 —— C18H16N6OS
N-(pyridin-2-ylmethyl)-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 (5R,6S)-7-oxo-5-propan-2-yl-2-(trifluoromethyl)-5,6-dihydro-1H-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C12H15F3N4O3
ethyl (5R,6S)-7-oxo-5-propan-2-yl-2-(trifluoromethyl)-5,6-dihydro-1H-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
—— 2-[(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]ethanol —— C15H19N5O2S
2-[(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]ethanol
—— (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-(2-hydroxyethyl)azanium —— C15H20N5O2S+
(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-(2-hydroxyethyl)azanium
—— N-[[5-[2-(5,7-dimethyl-[1,2,4]triazolo[1,5-a]pyrimidin-2-yl)ethenyl]-1-methyl-1,2,4-triazol-3-yl]methyl]cyclopropanamine —— C16H20N8
N-[[5-[2-(5,7-dimethyl-[1,2,4]triazolo[1,5-a]pyrimidin-2-yl)ethenyl]-1-methyl-1,2,4-triazol-3-yl]methyl]cyclopropanamine
—— 6-chloro-N-[(2-fluorophenyl)methyl]-5,7-dimethyl-[1,2,4]triazolo[1,5-a]pyrimidin-2-amine —— C14H13ClFN5
6-chloro-N-[(2-fluorophenyl)methyl]-5,7-dimethyl-[1,2,4]triazolo[1,5-a]pyrimidin-2-amine
—— (5S,7R)-7-(4-ethoxyphenyl)-5-(3-methoxyphenyl)-1,5,6,7-tetrahydro-[1,2,4]triazolo[1,5-a]pyrimidin-2-amine —— C20H23N5O2
(5S,7R)-7-(4-ethoxyphenyl)-5-(3-methoxyphenyl)-1,5,6,7-tetrahydro-[1,2,4]triazolo[1,5-a]pyrimidin-2-amine
—— 1-[(7S)-7-(2-chlorophenyl)-5-phenyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidin-2-yl]pyrrolidine-2,5-dione —— C21H16ClN5O2
1-[(7S)-7-(2-chlorophenyl)-5-phenyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidin-2-yl]pyrrolidine-2,5-dione
—— (5R,7S)-5-(3,4-dichlorophenyl)-7-(4-methoxyphenyl)-1,5,6,7-tetrahydro-[1,2,4]triazolo[1,5-a]pyrimidin-2-amine —— C18H17Cl2N5O
(5R,7S)-5-(3,4-dichlorophenyl)-7-(4-methoxyphenyl)-1,5,6,7-tetrahydro-[1,2,4]triazolo[1,5-a]pyrimidin-2-amine
—— 6-Chloro-2-[(2-fluorobenzyl)amino]-5-methyl[1,2,4]triazolo[1,5-a]pyrimidin-7-ol —— C13H11ClFN5O
6-Chloro-2-[(2-fluorobenzyl)amino]-5-methyl[1,2,4]triazolo[1,5-a]pyrimidin-7-ol
—— (5R,7R)-5-(3,4-dichlorophenyl)-7-(4-methoxyphenyl)-1,5,6,7-tetrahydro-[1,2,4]triazolo[1,5-a]pyrimidin-2-amine —— C18H17Cl2N5O
(5R,7R)-5-(3,4-dichlorophenyl)-7-(4-methoxyphenyl)-1,5,6,7-tetrahydro-[1,2,4]triazolo[1,5-a]pyrimidin-2-amine
—— N-[[5-[2-(5,7-dimethyl-[1,2,4]triazolo[1,5-a]pyrimidin-2-yl)ethenyl]-1-methyl-1,2,4-triazol-3-yl]methyl]cyclopropanamine;5-methyl-2-[2-(2-methyl-5-pyrrolidin-1-yl-1,2,4-triazol-3-yl)ethyl]-[1,2,4]triazolo[1,5-a]pyridine —— C32H41N15
N-[[5-[2-(5,7-dimethyl-[1,2,4]triazolo[1,5-a]pyrimidin-2-yl)ethenyl]-1-methyl-1,2,4-triazol-3-yl]methyl]cyclopropanamine;5-methyl-2-[2-(2-methyl-5-pyrrolidin-1-yl-1,2,4-triazol-3-yl)ethyl]-[1,2,4]triazolo[1,5-a]pyridine
—— 2-[(E)-2-(6-bromo-pyrazin-2-yl)-vinyl]-5,7-dimethyl-[1,2,4]triazolo[1,5-a]pyrimidine —— C13H11BrN6
2-[(E)-2-(6-bromo-pyrazin-2-yl)-vinyl]-5,7-dimethyl-[1,2,4]triazolo[1,5-a]pyrimidine
—— (5R,7S)-7-(4-ethoxyphenyl)-5-(3-methoxyphenyl)-1,5,6,7-tetrahydro-[1,2,4]triazolo[1,5-a]pyrimidin-2-amine —— C20H23N5O2
(5R,7S)-7-(4-ethoxyphenyl)-5-(3-methoxyphenyl)-1,5,6,7-tetrahydro-[1,2,4]triazolo[1,5-a]pyrimidin-2-amine
—— (15R)-N-[(2R)-2-hydroxypropyl]-15-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 —— C16H19N5O2S
(15R)-N-[(2R)-2-hydroxypropyl]-15-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
—— (5R,7R)-7-(4-ethoxyphenyl)-5-(3-methoxyphenyl)-1,5,6,7-tetrahydro-[1,2,4]triazolo[1,5-a]pyrimidin-2-amine —— C20H23N5O2
(5R,7R)-7-(4-ethoxyphenyl)-5-(3-methoxyphenyl)-1,5,6,7-tetrahydro-[1,2,4]triazolo[1,5-a]pyrimidin-2-amine
—— (15S)-N-[(2R)-2-hydroxypropyl]-15-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 —— C16H19N5O2S
(15S)-N-[(2R)-2-hydroxypropyl]-15-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-[5-oxo-2-(trifluoromethyl)-4H-[1,2,4]triazolo[1,5-a]pyrimidin-7-yl]furan-2-carboxamide —— C11H6F3N5O3
N-[5-oxo-2-(trifluoromethyl)-4H-[1,2,4]triazolo[1,5-a]pyrimidin-7-yl]furan-2-carboxamide
—— (5S,7R)-5-(3,4-dichlorophenyl)-7-(4-methoxyphenyl)-1,5,6,7-tetrahydro-[1,2,4]triazolo[1,5-a]pyrimidin-2-amine —— C18H17Cl2N5O
(5S,7R)-5-(3,4-dichlorophenyl)-7-(4-methoxyphenyl)-1,5,6,7-tetrahydro-[1,2,4]triazolo[1,5-a]pyrimidin-2-amine
—— N-cyclopropyl-5-[(E)-2-(5,7-dimethyl-[1,2,4]triazolo[1,5-a]pyrimidin-2-yl)ethenyl]-N,1-dimethyl-1,2,4-triazol-3-amine;5-methyl-2-[2-(2-methyl-5-pyrrolidin-1-yl-1,2,4-triazol-3-yl)ethyl]-[1,2,4]triazolo[1,5-a]pyridine —— C32H41N15
N-cyclopropyl-5-[(E)-2-(5,7-dimethyl-[1,2,4]triazolo[1,5-a]pyrimidin-2-yl)ethenyl]-N,1-dimethyl-1,2,4-triazol-3-amine;5-methyl-2-[2-(2-methyl-5-pyrrolidin-1-yl-1,2,4-triazol-3-yl)ethyl]-[1,2,4]triazolo[1,5-a]pyridine
—— 1-[(7R)-7-(2-chlorophenyl)-5-phenyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidin-2-yl]pyrrolidine-2,5-dione —— C21H16ClN5O2
1-[(7R)-7-(2-chlorophenyl)-5-phenyl-1,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidin-2-yl]pyrrolidine-2,5-dione
—— 5,7-dimethyl-2-[(E)-2-(2-methyl-5-pyrrolidin-1-yl-1,2,4-triazol-3-yl)ethenyl]-[1,2,4]triazolo[1,5-a]pyrimidine —— C16H20N8
5,7-dimethyl-2-[(E)-2-(2-methyl-5-pyrrolidin-1-yl-1,2,4-triazol-3-yl)ethenyl]-[1,2,4]triazolo[1,5-a]pyrimidine
—— (5S,7S)-5-(3,4-dichlorophenyl)-7-(4-methoxyphenyl)-1,5,6,7-tetrahydro-[1,2,4]triazolo[1,5-a]pyrimidin-2-amine —— C18H17Cl2N5O
(5S,7S)-5-(3,4-dichlorophenyl)-7-(4-methoxyphenyl)-1,5,6,7-tetrahydro-[1,2,4]triazolo[1,5-a]pyrimidin-2-amine
—— (13R)-4-ethyl-13-methyl-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene —— C14H16N4S
(13R)-4-ethyl-13-methyl-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaene
—— (15S)-N-[(2S)-2-hydroxypropyl]-15-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 —— C16H19N5O2S
(15S)-N-[(2S)-2-hydroxypropyl]-15-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
—— (15R)-N-[(2S)-2-hydroxypropyl]-15-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 —— C16H19N5O2S
(15R)-N-[(2S)-2-hydroxypropyl]-15-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
—— 2-[(E)-2-[5-(azetidin-1-yl)-2-methyl-1,2,4-triazol-3-yl]ethenyl]-5,8-dimethyl-[1,2,4]triazolo[1,5-c]pyrimidine;2-[6-chloro-5-methyl-2-[2-(2-methyl-5-pyrrolidin-1-yl-1,2,4-triazol-3-yl)ethyl]-[1,2,4]triazolo[1,5-a]pyridin-8-yl]propan-2-ol —— C34H44ClN15O
2-[(E)-2-[5-(azetidin-1-yl)-2-methyl-1,2,4-triazol-3-yl]ethenyl]-5,8-dimethyl-[1,2,4]triazolo[1,5-c]pyrimidine;2-[6-chloro-5-methyl-2-[2-(2-methyl-5-pyrrolidin-1-yl-1,2,4-triazol-3-yl)ethyl]-[1,2,4]triazolo[1,5-a]pyridin-8-yl]propan-2-ol
—— 6-Chloro-2-[(2-chloro-6-fluorobenzyl)amino]-5-methyl[1,2,4]triazolo[1,5-a]pyrimidin-7-ol —— C13H10Cl2FN5O
6-Chloro-2-[(2-chloro-6-fluorobenzyl)amino]-5-methyl[1,2,4]triazolo[1,5-a]pyrimidin-7-ol
—— 7-benzyl-2-[(2,6-dimethylphenoxy)methyl]-7H-pyrazolo[4,3-e][1,2,4]triazolo[1,5-c]pyrimidine —— C22H20N6O
7-benzyl-2-[(2,6-dimethylphenoxy)methyl]-7H-pyrazolo[4,3-e][1,2,4]triazolo[1,5-c]pyrimidine
—— 2-[[(14R)-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-4-carbonyl]amino]ethyl-diethylazanium —— C20H29N6OS+
2-[[(14R)-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-4-carbonyl]amino]ethyl-diethylazanium
—— ethyl (5S,6R)-7-oxo-5-propan-2-yl-2-(trifluoromethyl)-5,6-dihydro-1H-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate —— C12H15F3N4O3
ethyl (5S,6R)-7-oxo-5-propan-2-yl-2-(trifluoromethyl)-5,6-dihydro-1H-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate
—— 5,7-Dimethyl-2-[2-[2-methyl-5-[2-(trifluoromethyl)pyrrolidin-1-yl]-1,2,4-triazol-3-yl]ethyl]-[1,2,4]triazolo[1,5-c]pyrimidine —— C17H21F3N8
5,7-Dimethyl-2-[2-[2-methyl-5-[2-(trifluoromethyl)pyrrolidin-1-yl]-1,2,4-triazol-3-yl]ethyl]-[1,2,4]triazolo[1,5-c]pyrimidine