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生物素及其衍生物

中文名称 英文名称 CAS号 化学式 结构式图片
—— (2S)-6-[6-[5-[(3aS,4R,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]pentanoylamino]hexanoylamino]-2-(6-aminohexanoylamino)-N-(2-methylsulfonylsulfanylethyl)hexanamide —— C31H57N7O7S3
(2S)-6-[6-[5-[(3aS,4R,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]pentanoylamino]hexanoylamino]-2-(6-aminohexanoylamino)-N-(2-methylsulfonylsulfanylethyl)hexanamide
—— N-[5-[5-[(3aS,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]pentanoylamino]pentyl]-10-[ethoxy(phenylmethoxy)phosphoryl]decanamide —— C34H57N4O6PS
N-[5-[5-[(3aS,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]pentanoylamino]pentyl]-10-[ethoxy(phenylmethoxy)phosphoryl]decanamide
—— 5-[(3aS,4S,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-[(1R)-2,2-dimethyl-1-[3-(trifluoromethyl)phenyl]propyl]pentanamide —— C22H30F3N3O2S
5-[(3aS,4S,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-[(1R)-2,2-dimethyl-1-[3-(trifluoromethyl)phenyl]propyl]pentanamide
—— 5-[(3aS,4S,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-[(1S)-2,2-dimethyl-1-[3-(trifluoromethyl)phenyl]propyl]pentanamide —— C22H30F3N3O2S
5-[(3aS,4S,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-[(1S)-2,2-dimethyl-1-[3-(trifluoromethyl)phenyl]propyl]pentanamide
—— 5-[(3aS,4S,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-[(1R)-1-[3-(trifluoromethyl)phenyl]butyl]pentanamide —— C21H28F3N3O2S
5-[(3aS,4S,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-[(1R)-1-[3-(trifluoromethyl)phenyl]butyl]pentanamide
—— 5-[(3aS,4S,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-[(S)-cyclopropyl-[4-(2-methylpropyl)phenyl]methyl]pentanamide —— C24H35N3O2S
5-[(3aS,4S,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-[(S)-cyclopropyl-[4-(2-methylpropyl)phenyl]methyl]pentanamide
—— 5-[(3aS,4S,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-[(R)-cyclopropyl-[4-(2-methylpropyl)phenyl]methyl]pentanamide —— C24H35N3O2S
5-[(3aS,4S,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-[(R)-cyclopropyl-[4-(2-methylpropyl)phenyl]methyl]pentanamide
—— 5-[(3aS,4S,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-[(2R)-1-(2,4-dichlorophenyl)propan-2-yl]pentanamide —— C19H25Cl2N3O2S
5-[(3aS,4S,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-[(2R)-1-(2,4-dichlorophenyl)propan-2-yl]pentanamide
—— 5-[(3aS,4S,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-[(2S)-1-(2,4-dichlorophenyl)propan-2-yl]pentanamide —— C19H25Cl2N3O2S
5-[(3aS,4S,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-[(2S)-1-(2,4-dichlorophenyl)propan-2-yl]pentanamide
—— 5-[(3aS,4S,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-[(1S)-1-[3-(difluoromethoxy)phenyl]ethyl]pentanamide —— C19H25F2N3O3S
5-[(3aS,4S,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-[(1S)-1-[3-(difluoromethoxy)phenyl]ethyl]pentanamide
—— 5-[(3aS,4S,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-[(1R)-1-[3-(difluoromethoxy)phenyl]ethyl]pentanamide —— C19H25F2N3O3S
5-[(3aS,4S,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-[(1R)-1-[3-(difluoromethoxy)phenyl]ethyl]pentanamide
—— (3aS,4S,6aR)-4-[5-[(2R)-2-(2-methylphenyl)pyrrolidin-1-yl]-5-oxopentyl]-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-2-one —— C21H29N3O2S
(3aS,4S,6aR)-4-[5-[(2R)-2-(2-methylphenyl)pyrrolidin-1-yl]-5-oxopentyl]-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-2-one
—— (3aS,4S,6aR)-4-[5-[(2S)-2-(2-methylphenyl)pyrrolidin-1-yl]-5-oxopentyl]-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-2-one —— C21H29N3O2S
(3aS,4S,6aR)-4-[5-[(2S)-2-(2-methylphenyl)pyrrolidin-1-yl]-5-oxopentyl]-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-2-one
—— 5-[(3aS,4S,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-[4-[[(2S)-2-methylpiperidin-1-yl]methyl]phenyl]pentanamide —— C23H34N4O2S
5-[(3aS,4S,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-[4-[[(2S)-2-methylpiperidin-1-yl]methyl]phenyl]pentanamide
—— 5-[(3aS,4S,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-[4-[[(2R)-2-methylpiperidin-1-yl]methyl]phenyl]pentanamide —— C23H34N4O2S
5-[(3aS,4S,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-[4-[[(2R)-2-methylpiperidin-1-yl]methyl]phenyl]pentanamide
—— 5-[(3aS,4R,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-[(Z)-(2,3,4,5,6-pentafluorophenyl)methylideneamino]pentanamide —— C17H17F5N4O2S
5-[(3aS,4R,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-[(Z)-(2,3,4,5,6-pentafluorophenyl)methylideneamino]pentanamide
—— (3S)-1-[5-[(3aR,4R,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]pentanoyl]-2,5-dioxopyrrolidine-3-sulfonic acid —— C14H19N3O7S2
(3S)-1-[5-[(3aR,4R,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]pentanoyl]-2,5-dioxopyrrolidine-3-sulfonic acid
—— 5-[(3aR,4R,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(6-hydrazinyl-6-oxohexyl)pentanamide —— C16H29N5O3S
5-[(3aR,4R,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(6-hydrazinyl-6-oxohexyl)pentanamide
—— (3S)-1-[5-[(3aS,4R,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]pentanoyl]-2,5-dioxopyrrolidine-3-sulfonic acid —— C14H19N3O7S2
(3S)-1-[5-[(3aS,4R,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]pentanoyl]-2,5-dioxopyrrolidine-3-sulfonic acid
—— 5-[(3aR,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(5-methyl-1,3,4-thiadiazol-2-yl)pentanamide —— C13H19N5O2S2
5-[(3aR,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(5-methyl-1,3,4-thiadiazol-2-yl)pentanamide
—— 5-[(3aR,4R,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(5-methyl-1,3,4-thiadiazol-2-yl)pentanamide —— C13H19N5O2S2
5-[(3aR,4R,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(5-methyl-1,3,4-thiadiazol-2-yl)pentanamide
—— 5-[(3aS,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(5-methyl-1,3,4-thiadiazol-2-yl)pentanamide —— C13H19N5O2S2
5-[(3aS,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(5-methyl-1,3,4-thiadiazol-2-yl)pentanamide
—— [4-[3-[3-[5-[(3aS,4S,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]pentanoylamino]propyl-methylamino]propylamino]-3-nitrophenyl]imino-methylideneazanium —— C24H37N8O4S+
[4-[3-[3-[5-[(3aS,4S,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]pentanoylamino]propyl-methylamino]propylamino]-3-nitrophenyl]imino-methylideneazanium
—— 5-[(3aR,4R,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(4-acetamidophenyl)pentanamide —— C18H24N4O3S
5-[(3aR,4R,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(4-acetamidophenyl)pentanamide
—— 5-[(3aR,4R,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(2,3-dihydro-1H-inden-2-yl)pentanamide —— C19H25N3O2S
5-[(3aR,4R,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(2,3-dihydro-1H-inden-2-yl)pentanamide
—— 5-[(3aR,4R,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(4-pyridin-2-yl-1,3-thiazol-2-yl)pentanamide —— C18H21N5O2S2
5-[(3aR,4R,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(4-pyridin-2-yl-1,3-thiazol-2-yl)pentanamide
—— 5-[(3aS,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(2,3-dihydro-1H-inden-2-yl)pentanamide —— C19H25N3O2S
5-[(3aS,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(2,3-dihydro-1H-inden-2-yl)pentanamide
—— 5-[(3aR,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(4-pyridin-2-yl-1,3-thiazol-2-yl)pentanamide —— C18H21N5O2S2
5-[(3aR,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(4-pyridin-2-yl-1,3-thiazol-2-yl)pentanamide
—— 5-[(3aS,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(4-acetamidophenyl)pentanamide —— C18H24N4O3S
5-[(3aS,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(4-acetamidophenyl)pentanamide
—— 5-[(3aS,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(1-methylindol-4-yl)pentanamide —— C19H24N4O2S
5-[(3aS,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(1-methylindol-4-yl)pentanamide
—— 5-[(3aR,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(4-acetamidophenyl)pentanamide —— C18H24N4O3S
5-[(3aR,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(4-acetamidophenyl)pentanamide
—— 5-[(3aR,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(1-methylindol-4-yl)pentanamide —— C19H24N4O2S
5-[(3aR,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(1-methylindol-4-yl)pentanamide
—— 5-[(3aS,4R,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(2,3-dihydro-1H-inden-2-yl)pentanamide —— C19H25N3O2S
5-[(3aS,4R,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(2,3-dihydro-1H-inden-2-yl)pentanamide
—— 5-[(3aR,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(2,3-dihydro-1H-inden-2-yl)pentanamide —— C19H25N3O2S
5-[(3aR,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(2,3-dihydro-1H-inden-2-yl)pentanamide
—— 5-[(3aR,4R,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(1-methylindol-4-yl)pentanamide —— C19H24N4O2S
5-[(3aR,4R,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(1-methylindol-4-yl)pentanamide
—— 5-[(3aS,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(4-pyridin-2-yl-1,3-thiazol-2-yl)pentanamide —— C18H21N5O2S2
5-[(3aS,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(4-pyridin-2-yl-1,3-thiazol-2-yl)pentanamide
—— 5-[(3aS,4R,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(1-methylindol-4-yl)pentanamide —— C19H24N4O2S
5-[(3aS,4R,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(1-methylindol-4-yl)pentanamide
—— 5-[(3aS,4R,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(4-methylphenyl)pentanamide —— C17H23N3O2S
5-[(3aS,4R,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(4-methylphenyl)pentanamide
—— 5-[(3aS,4R,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(4,5-dimethyl-1,3-thiazol-2-yl)pentanamide —— C15H22N4O2S2
5-[(3aS,4R,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(4,5-dimethyl-1,3-thiazol-2-yl)pentanamide
—— 5-[(3aS,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(4-methylphenyl)pentanamide —— C17H23N3O2S
5-[(3aS,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(4-methylphenyl)pentanamide
—— 5-[(3aR,4R,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(4,5-dimethyl-1,3-thiazol-2-yl)pentanamide —— C15H22N4O2S2
5-[(3aR,4R,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(4,5-dimethyl-1,3-thiazol-2-yl)pentanamide
—— 5-[(3aR,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-[4-(trifluoromethoxy)phenyl]pentanamide —— C17H20F3N3O3S
5-[(3aR,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-[4-(trifluoromethoxy)phenyl]pentanamide
—— 5-[(3aR,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(4,5-dimethyl-1,3-thiazol-2-yl)pentanamide —— C15H22N4O2S2
5-[(3aR,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(4,5-dimethyl-1,3-thiazol-2-yl)pentanamide
—— 5-[(3aS,4R,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-[4-(trifluoromethoxy)phenyl]pentanamide —— C17H20F3N3O3S
5-[(3aS,4R,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-[4-(trifluoromethoxy)phenyl]pentanamide
—— 5-[(3aS,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-benzylpentanamide —— C17H23N3O2S
5-[(3aS,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-benzylpentanamide
—— 5-[(3aS,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(4,5-dimethyl-1,3-thiazol-2-yl)pentanamide —— C15H22N4O2S2
5-[(3aS,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(4,5-dimethyl-1,3-thiazol-2-yl)pentanamide
—— 5-[(3aS,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-[4-(trifluoromethoxy)phenyl]pentanamide —— C17H20F3N3O3S
5-[(3aS,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-[4-(trifluoromethoxy)phenyl]pentanamide
—— 5-[(3aR,4R,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(4-tert-butyl-1,3-thiazol-2-yl)pentanamide —— C17H26N4O2S2
5-[(3aR,4R,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(4-tert-butyl-1,3-thiazol-2-yl)pentanamide
—— 5-[(3aR,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-benzylpentanamide —— C17H23N3O2S
5-[(3aR,4S,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-benzylpentanamide
—— 5-[(3aR,4R,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(1H-indol-6-yl)pentanamide —— C18H22N4O2S
5-[(3aR,4R,6aS)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-(1H-indol-6-yl)pentanamide