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吡啶并嘧啶类

中文名称 英文名称 CAS号 化学式 结构式图片
—— 5-[(2S)-1-butanoylpiperidin-2-yl]-11-(thiophen-3-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C23H29N5O2S
5-[(2S)-1-butanoylpiperidin-2-yl]-11-(thiophen-3-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 5-[(2R)-1-(2-methylpropanoyl)piperidin-2-yl]-11-(pyridin-3-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C24H30N6O2
5-[(2R)-1-(2-methylpropanoyl)piperidin-2-yl]-11-(pyridin-3-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 11-[(1R,2R)-2-methylcyclopropanecarbonyl]-5-[(2S)-1-propan-2-ylpiperidin-2-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C22H31N5O2
11-[(1R,2R)-2-methylcyclopropanecarbonyl]-5-[(2S)-1-propan-2-ylpiperidin-2-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 11-(2-ethylbutanoyl)-5-[(2R)-1-propan-2-ylpiperidin-2-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C23H35N5O2
11-(2-ethylbutanoyl)-5-[(2R)-1-propan-2-ylpiperidin-2-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 11-(2-methylpropanoyl)-5-[(2S)-1-(thiophen-2-ylmethyl)piperidin-2-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C23H29N5O2S
11-(2-methylpropanoyl)-5-[(2S)-1-(thiophen-2-ylmethyl)piperidin-2-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 5-[(2S)-1-butanoylpiperidin-2-yl]-11-(pyridin-3-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C24H30N6O2
5-[(2S)-1-butanoylpiperidin-2-yl]-11-(pyridin-3-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 5-[(2S)-1-(cyclobutanecarbonyl)piperidin-2-yl]-11-(pyridin-3-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C25H30N6O2
5-[(2S)-1-(cyclobutanecarbonyl)piperidin-2-yl]-11-(pyridin-3-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 5-[(3R)-1-butanoylpiperidin-3-yl]-11-(oxan-4-yl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C23H33N5O3
5-[(3R)-1-butanoylpiperidin-3-yl]-11-(oxan-4-yl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 11-(2-methylpropanoyl)-5-[(2S)-1-(thiophen-3-ylmethyl)piperidin-2-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C23H29N5O2S
11-(2-methylpropanoyl)-5-[(2S)-1-(thiophen-3-ylmethyl)piperidin-2-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 5-[(2S)-1-(cyclopropylmethyl)piperidin-2-yl]-11-(2-methylpropanoyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C22H31N5O2
5-[(2S)-1-(cyclopropylmethyl)piperidin-2-yl]-11-(2-methylpropanoyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 5-[(2R)-1-propanoylpiperidin-2-yl]-11-(pyridin-3-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C23H28N6O2
5-[(2R)-1-propanoylpiperidin-2-yl]-11-(pyridin-3-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 5-[(2R)-1-butanoylpiperidin-2-yl]-11-(thiophen-3-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C23H29N5O2S
5-[(2R)-1-butanoylpiperidin-2-yl]-11-(thiophen-3-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 5-[(2S)-1-(2-methylpropanoyl)piperidin-2-yl]-11-(thiophen-2-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C23H29N5O2S
5-[(2S)-1-(2-methylpropanoyl)piperidin-2-yl]-11-(thiophen-2-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 5-[(2R)-1-butanoylpiperidin-2-yl]-11-(pyridin-3-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C24H30N6O2
5-[(2R)-1-butanoylpiperidin-2-yl]-11-(pyridin-3-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 5-[(3S)-1-propanoylpiperidin-3-yl]-11-(pyridin-4-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C23H28N6O2
5-[(3S)-1-propanoylpiperidin-3-yl]-11-(pyridin-4-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 11-butanoyl-5-[(2R)-1-(thiophen-2-ylmethyl)piperidin-2-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C23H29N5O2S
11-butanoyl-5-[(2R)-1-(thiophen-2-ylmethyl)piperidin-2-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 11-(cyclopropanecarbonyl)-5-[(2R)-1-(thiophen-3-ylmethyl)piperidin-2-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C23H27N5O2S
11-(cyclopropanecarbonyl)-5-[(2R)-1-(thiophen-3-ylmethyl)piperidin-2-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 11-(oxan-4-yl)-5-[(3R)-1-propanoylpiperidin-3-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C22H31N5O3
11-(oxan-4-yl)-5-[(3R)-1-propanoylpiperidin-3-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 11-(cyclopropanecarbonyl)-5-[(2S)-1-(thiophen-2-ylmethyl)piperidin-2-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C23H27N5O2S
11-(cyclopropanecarbonyl)-5-[(2S)-1-(thiophen-2-ylmethyl)piperidin-2-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 5-[(3R)-1-(cyclobutanecarbonyl)piperidin-3-yl]-11-(pyridin-4-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C25H30N6O2
5-[(3R)-1-(cyclobutanecarbonyl)piperidin-3-yl]-11-(pyridin-4-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 5-[(3R)-1-(2,2-dimethylpropanoyl)piperidin-3-yl]-11-(pyridin-4-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C25H32N6O2
5-[(3R)-1-(2,2-dimethylpropanoyl)piperidin-3-yl]-11-(pyridin-4-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 11-(2-methylpropanoyl)-5-[(3S)-1-(pyridin-3-ylmethyl)piperidin-3-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C24H30N6O2
11-(2-methylpropanoyl)-5-[(3S)-1-(pyridin-3-ylmethyl)piperidin-3-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 5-[(3S)-1-[(2S)-2-methylbutanoyl]piperidin-3-yl]-11-(pyridin-4-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C25H32N6O2
5-[(3S)-1-[(2S)-2-methylbutanoyl]piperidin-3-yl]-11-(pyridin-4-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 5-[(3S)-1-(2,2-dimethylpropanoyl)piperidin-3-yl]-11-(oxan-4-yl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C24H35N5O3
5-[(3S)-1-(2,2-dimethylpropanoyl)piperidin-3-yl]-11-(oxan-4-yl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 5-[(3R)-1-(2,2-dimethylpropanoyl)piperidin-3-yl]-11-(oxan-4-yl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C24H35N5O3
5-[(3R)-1-(2,2-dimethylpropanoyl)piperidin-3-yl]-11-(oxan-4-yl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 5-[(3R)-1-(cyclopropanecarbonyl)piperidin-3-yl]-11-(pyridin-4-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C24H28N6O2
5-[(3R)-1-(cyclopropanecarbonyl)piperidin-3-yl]-11-(pyridin-4-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 5-[(3R)-1-(cyclopropanecarbonyl)piperidin-3-yl]-11-(oxan-4-yl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C23H31N5O3
5-[(3R)-1-(cyclopropanecarbonyl)piperidin-3-yl]-11-(oxan-4-yl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 5-[(3S)-1-[(2R)-2-methylbutanoyl]piperidin-3-yl]-11-(pyridin-4-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C25H32N6O2
5-[(3S)-1-[(2R)-2-methylbutanoyl]piperidin-3-yl]-11-(pyridin-4-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 5-[(3S)-1-butanoylpiperidin-3-yl]-11-(oxan-4-yl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C23H33N5O3
5-[(3S)-1-butanoylpiperidin-3-yl]-11-(oxan-4-yl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 11-[(1R,2S)-2-methylcyclopropanecarbonyl]-5-[(2S)-1-propan-2-ylpiperidin-2-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C22H31N5O2
11-[(1R,2S)-2-methylcyclopropanecarbonyl]-5-[(2S)-1-propan-2-ylpiperidin-2-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 5-[(3R)-1-(cyclobutanecarbonyl)piperidin-3-yl]-11-(oxan-4-yl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C24H33N5O3
5-[(3R)-1-(cyclobutanecarbonyl)piperidin-3-yl]-11-(oxan-4-yl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 5-[(3R)-1-(2-methoxyacetyl)piperidin-3-yl]-11-(oxan-4-yl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C22H31N5O4
5-[(3R)-1-(2-methoxyacetyl)piperidin-3-yl]-11-(oxan-4-yl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 5-[(3R)-1-propanoylpiperidin-3-yl]-11-(pyridin-4-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C23H28N6O2
5-[(3R)-1-propanoylpiperidin-3-yl]-11-(pyridin-4-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 5-[(3R)-1-[(2R)-2-methylbutanoyl]piperidin-3-yl]-11-(pyridin-4-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C25H32N6O2
5-[(3R)-1-[(2R)-2-methylbutanoyl]piperidin-3-yl]-11-(pyridin-4-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 5-[(3R)-1-[[(1R)-cyclohex-3-en-1-yl]methyl]piperidin-3-yl]-11-(cyclopropanecarbonyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C25H33N5O2
5-[(3R)-1-[[(1R)-cyclohex-3-en-1-yl]methyl]piperidin-3-yl]-11-(cyclopropanecarbonyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 5-[(3S)-1-(cyclobutanecarbonyl)piperidin-3-yl]-11-(pyridin-4-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C25H30N6O2
5-[(3S)-1-(cyclobutanecarbonyl)piperidin-3-yl]-11-(pyridin-4-ylmethyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 11-(oxan-4-yl)-5-[(3S)-1-propanoylpiperidin-3-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C22H31N5O3
11-(oxan-4-yl)-5-[(3S)-1-propanoylpiperidin-3-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 11-(2-methylpropanoyl)-5-[(2S)-1-[(3-methylpyridin-4-yl)methyl]piperidin-2-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C25H32N6O2
11-(2-methylpropanoyl)-5-[(2S)-1-[(3-methylpyridin-4-yl)methyl]piperidin-2-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 11-butanoyl-5-[1-[[(1S)-cyclohex-3-en-1-yl]methyl]piperidin-4-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C25H35N5O2
11-butanoyl-5-[1-[[(1S)-cyclohex-3-en-1-yl]methyl]piperidin-4-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 5-[1-[[(1R)-cyclohex-3-en-1-yl]methyl]piperidin-4-yl]-11-(2-methoxyacetyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C24H33N5O3
5-[1-[[(1R)-cyclohex-3-en-1-yl]methyl]piperidin-4-yl]-11-(2-methoxyacetyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 11-(2-Methylpropanoyl)-5-[1-(pyridin-2-ylmethyl)piperidin-4-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C24H30N6O2
11-(2-Methylpropanoyl)-5-[1-(pyridin-2-ylmethyl)piperidin-4-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 2-[(3R)-1-(4-methoxycyclohexanecarbonyl)piperidin-3-yl]-6-methyl-3,5,7,8-tetrahydropyrido[4,3-d]pyrimidin-4-one —— C21H32N4O3
2-[(3R)-1-(4-methoxycyclohexanecarbonyl)piperidin-3-yl]-6-methyl-3,5,7,8-tetrahydropyrido[4,3-d]pyrimidin-4-one
—— 11-Butanoyl-5-[1-(cyclohexylmethyl)piperidin-4-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C25H37N5O2
11-Butanoyl-5-[1-(cyclohexylmethyl)piperidin-4-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 5-[1-[[(1S)-cyclohex-3-en-1-yl]methyl]piperidin-4-yl]-11-(2-methylpropanoyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C25H35N5O2
5-[1-[[(1S)-cyclohex-3-en-1-yl]methyl]piperidin-4-yl]-11-(2-methylpropanoyl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 2-[1-(4-Methoxycyclohexanecarbonyl)piperidin-4-yl]-7-methyl-3,5,6,8-tetrahydropyrido[3,4-d]pyrimidin-4-one —— C21H32N4O3
2-[1-(4-Methoxycyclohexanecarbonyl)piperidin-4-yl]-7-methyl-3,5,6,8-tetrahydropyrido[3,4-d]pyrimidin-4-one
—— 11-butanoyl-5-[1-(3,6-dihydro-2H-pyran-5-ylmethyl)piperidin-4-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C24H33N5O3
11-butanoyl-5-[1-(3,6-dihydro-2H-pyran-5-ylmethyl)piperidin-4-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 11-Butanoyl-5-[1-(pyridin-3-ylmethyl)piperidin-4-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C24H30N6O2
11-Butanoyl-5-[1-(pyridin-3-ylmethyl)piperidin-4-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 5-[(3S)-1-(cyclobutanecarbonyl)piperidin-3-yl]-11-(oxan-4-yl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C24H33N5O3
5-[(3S)-1-(cyclobutanecarbonyl)piperidin-3-yl]-11-(oxan-4-yl)-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 11-(Cyclopropanecarbonyl)-5-[1-[(3-methylpyridin-4-yl)methyl]piperidin-4-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C25H30N6O2
11-(Cyclopropanecarbonyl)-5-[1-[(3-methylpyridin-4-yl)methyl]piperidin-4-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one
—— 11-(2-methylpropanoyl)-5-[(3R)-1-(pyridin-3-ylmethyl)piperidin-3-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one —— C24H30N6O2
11-(2-methylpropanoyl)-5-[(3R)-1-(pyridin-3-ylmethyl)piperidin-3-yl]-2,6,7,11-tetrazatricyclo[7.4.0.03,7]trideca-1(9),2,4-trien-8-one