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    —— (6S)-1-N-benzyl-6-N-cyclopentyl-7-cyclopropyl-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C24H29N5O3
    (6S)-1-N-benzyl-6-N-cyclopentyl-7-cyclopropyl-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6S)-1-N-(4-chloro-2-methylphenyl)-6-N-cyclopentyl-7-cyclopropyl-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C24H28ClN5O3
    (6S)-1-N-(4-chloro-2-methylphenyl)-6-N-cyclopentyl-7-cyclopropyl-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6R)-7-cyclopropyl-1-N-(2,4-difluorophenyl)-6-N-[(4-methoxyphenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C26H25F2N5O4
    (6R)-7-cyclopropyl-1-N-(2,4-difluorophenyl)-6-N-[(4-methoxyphenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6R)-7-cyclopropyl-6-N-[(4-methoxyphenyl)methyl]-6-methyl-1-N-(3-methylbutyl)-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C25H33N5O4
    (6R)-7-cyclopropyl-6-N-[(4-methoxyphenyl)methyl]-6-methyl-1-N-(3-methylbutyl)-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6S)-1-N-[(3-chlorophenyl)methyl]-6-N-cyclopentyl-7-cyclopropyl-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C24H28ClN5O3
    (6S)-1-N-[(3-chlorophenyl)methyl]-6-N-cyclopentyl-7-cyclopropyl-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6S)-7-cyclopropyl-6-N-[(4-methoxyphenyl)methyl]-1-N-(3-methoxypropyl)-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C24H31N5O5
    (6S)-7-cyclopropyl-6-N-[(4-methoxyphenyl)methyl]-1-N-(3-methoxypropyl)-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6S)-7-cyclopropyl-1-N-[(3-methoxyphenyl)methyl]-6-N-[(4-methoxyphenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C28H31N5O5
    (6S)-7-cyclopropyl-1-N-[(3-methoxyphenyl)methyl]-6-N-[(4-methoxyphenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6S)-7-cyclopropyl-6-N-[(4-fluorophenyl)methyl]-6-methyl-8-oxo-1-N-(2-thiophen-2-ylethyl)-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C25H26FN5O3S
    (6S)-7-cyclopropyl-6-N-[(4-fluorophenyl)methyl]-6-methyl-8-oxo-1-N-(2-thiophen-2-ylethyl)-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6S)-1-(azepane-1-carbonyl)-7-cyclopropyl-N-[(4-methoxyphenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-6-carboxamide —— C26H33N5O4
    (6S)-1-(azepane-1-carbonyl)-7-cyclopropyl-N-[(4-methoxyphenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-6-carboxamide
    —— (6S)-1-N-butyl-7-cyclopropyl-6-N-[(4-methoxyphenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C24H31N5O4
    (6S)-1-N-butyl-7-cyclopropyl-6-N-[(4-methoxyphenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6S)-6-N-cyclopentyl-7-cyclopropyl-1-N-[2-(furan-2-yl)ethyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C23H29N5O4
    (6S)-6-N-cyclopentyl-7-cyclopropyl-1-N-[2-(furan-2-yl)ethyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6R)-1-N-(2-chloro-4-fluorophenyl)-7-cyclopropyl-6-N-[(4-fluorophenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C25H22ClF2N5O3
    (6R)-1-N-(2-chloro-4-fluorophenyl)-7-cyclopropyl-6-N-[(4-fluorophenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6R)-7-cyclopropyl-1-N-[(3-methoxyphenyl)methyl]-6-N-[(4-methoxyphenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C28H31N5O5
    (6R)-7-cyclopropyl-1-N-[(3-methoxyphenyl)methyl]-6-N-[(4-methoxyphenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6R)-6-N-cyclopentyl-7-cyclopropyl-6-methyl-1-N-[(4-methylphenyl)methyl]-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C25H31N5O3
    (6R)-6-N-cyclopentyl-7-cyclopropyl-6-methyl-1-N-[(4-methylphenyl)methyl]-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6R)-1-N-[(3-chlorophenyl)methyl]-7-cyclopropyl-6-N-[(4-methoxyphenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C27H28ClN5O4
    (6R)-1-N-[(3-chlorophenyl)methyl]-7-cyclopropyl-6-N-[(4-methoxyphenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6S)-1-N-cyclohexyl-7-cyclopropyl-6-N-[(4-fluorophenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C25H30FN5O3
    (6S)-1-N-cyclohexyl-7-cyclopropyl-6-N-[(4-fluorophenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6R)-7-cyclopropyl-1-N-(4-ethoxyphenyl)-6-N-[(4-fluorophenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C27H28FN5O4
    (6R)-7-cyclopropyl-1-N-(4-ethoxyphenyl)-6-N-[(4-fluorophenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6R)-6-N-cyclopentyl-7-cyclopropyl-1-N-[(3-fluorophenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C24H28FN5O3
    (6R)-6-N-cyclopentyl-7-cyclopropyl-1-N-[(3-fluorophenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6S)-6-N-cyclopentyl-7-cyclopropyl-1-N-(2-ethylphenyl)-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C25H31N5O3
    (6S)-6-N-cyclopentyl-7-cyclopropyl-1-N-(2-ethylphenyl)-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6S)-6-N-cyclopentyl-7-cyclopropyl-6-methyl-8-oxo-1-N-[3-(trifluoromethyl)phenyl]-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C24H26F3N5O3
    (6S)-6-N-cyclopentyl-7-cyclopropyl-6-methyl-8-oxo-1-N-[3-(trifluoromethyl)phenyl]-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6R)-7-cyclopropyl-1-N-[(4-ethylphenyl)methyl]-6-N-[(4-methoxyphenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C29H33N5O4
    (6R)-7-cyclopropyl-1-N-[(4-ethylphenyl)methyl]-6-N-[(4-methoxyphenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6R)-7-cyclopropyl-1-N-(2-methoxyethyl)-6-N-[(4-methoxyphenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C23H29N5O5
    (6R)-7-cyclopropyl-1-N-(2-methoxyethyl)-6-N-[(4-methoxyphenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6S)-7-cyclopropyl-6-N-[(4-fluorophenyl)methyl]-1-N-(2-methoxy-5-methylphenyl)-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C27H28FN5O4
    (6S)-7-cyclopropyl-6-N-[(4-fluorophenyl)methyl]-1-N-(2-methoxy-5-methylphenyl)-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6R)-7-cyclopropyl-6-N-[(4-fluorophenyl)methyl]-6-methyl-1-N-[(5-methylfuran-2-yl)methyl]-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C25H26FN5O4
    (6R)-7-cyclopropyl-6-N-[(4-fluorophenyl)methyl]-6-methyl-1-N-[(5-methylfuran-2-yl)methyl]-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6S)-7-cyclopropyl-6-N-[(4-methoxyphenyl)methyl]-6-methyl-8-oxo-1-N-(2-phenylethyl)-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C28H31N5O4
    (6S)-7-cyclopropyl-6-N-[(4-methoxyphenyl)methyl]-6-methyl-8-oxo-1-N-(2-phenylethyl)-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6R)-6-N-cyclopentyl-7-cyclopropyl-1-N-(2,6-dimethylphenyl)-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C25H31N5O3
    (6R)-6-N-cyclopentyl-7-cyclopropyl-1-N-(2,6-dimethylphenyl)-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6R)-1-N-cycloheptyl-7-cyclopropyl-6-N-[(4-methoxyphenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C27H35N5O4
    (6R)-1-N-cycloheptyl-7-cyclopropyl-6-N-[(4-methoxyphenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6R)-7-cyclopropyl-1-N-[2-(furan-2-yl)ethyl]-6-N-[(4-methoxyphenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C26H29N5O5
    (6R)-7-cyclopropyl-1-N-[2-(furan-2-yl)ethyl]-6-N-[(4-methoxyphenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6S)-6-N-cyclopentyl-7-cyclopropyl-6-methyl-1-N-[(4-methylphenyl)methyl]-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C25H31N5O3
    (6S)-6-N-cyclopentyl-7-cyclopropyl-6-methyl-1-N-[(4-methylphenyl)methyl]-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6S)-1-N-[2-(4-chlorophenyl)ethyl]-6-N-cyclopentyl-7-cyclopropyl-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C25H30ClN5O3
    (6S)-1-N-[2-(4-chlorophenyl)ethyl]-6-N-cyclopentyl-7-cyclopropyl-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6S)-7-cyclopropyl-6-N-[(4-methoxyphenyl)methyl]-6-methyl-1-N-(4-methylphenyl)-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C27H29N5O4
    (6S)-7-cyclopropyl-6-N-[(4-methoxyphenyl)methyl]-6-methyl-1-N-(4-methylphenyl)-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6S)-7-cyclopropyl-1-N-[2-(furan-2-yl)ethyl]-6-N-[(4-methoxyphenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C26H29N5O5
    (6S)-7-cyclopropyl-1-N-[2-(furan-2-yl)ethyl]-6-N-[(4-methoxyphenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6R)-7-cyclopropyl-1-N-[(4-ethoxyphenyl)methyl]-6-N-[(4-fluorophenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C28H30FN5O4
    (6R)-7-cyclopropyl-1-N-[(4-ethoxyphenyl)methyl]-6-N-[(4-fluorophenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6R)-7-cyclopropyl-6-N-[(4-fluorophenyl)methyl]-6-methyl-1-N-(2-morpholin-4-ylethyl)-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C25H31FN6O4
    (6R)-7-cyclopropyl-6-N-[(4-fluorophenyl)methyl]-6-methyl-1-N-(2-morpholin-4-ylethyl)-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6S)-6-N-cyclopentyl-7-cyclopropyl-1-N-[(2,5-dimethoxyphenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C26H33N5O5
    (6S)-6-N-cyclopentyl-7-cyclopropyl-1-N-[(2,5-dimethoxyphenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6S)-7-cyclopropyl-1-N-(2-ethoxyphenyl)-6-N-[(4-methoxyphenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C28H31N5O5
    (6S)-7-cyclopropyl-1-N-(2-ethoxyphenyl)-6-N-[(4-methoxyphenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6R)-1-N-[2-(2-chlorophenyl)ethyl]-7-cyclopropyl-6-N-[(4-fluorophenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C27H27ClFN5O3
    (6R)-1-N-[2-(2-chlorophenyl)ethyl]-7-cyclopropyl-6-N-[(4-fluorophenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6R)-7-cyclopropyl-6-N-[(4-methoxyphenyl)methyl]-1-N,6-dimethyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C21H25N5O4
    (6R)-7-cyclopropyl-6-N-[(4-methoxyphenyl)methyl]-1-N,6-dimethyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6S)-7-cyclopropyl-1-N-[(3-fluorophenyl)methyl]-6-N-[(4-methoxyphenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C27H28FN5O4
    (6S)-7-cyclopropyl-1-N-[(3-fluorophenyl)methyl]-6-N-[(4-methoxyphenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6S)-1-N-(2-chloro-4-methylphenyl)-6-N-cyclopentyl-7-cyclopropyl-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C24H28ClN5O3
    (6S)-1-N-(2-chloro-4-methylphenyl)-6-N-cyclopentyl-7-cyclopropyl-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6R)-1-N-(2-chloro-4-methylphenyl)-6-N-cyclopentyl-7-cyclopropyl-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C24H28ClN5O3
    (6R)-1-N-(2-chloro-4-methylphenyl)-6-N-cyclopentyl-7-cyclopropyl-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6S)-6-N-cyclopentyl-7-cyclopropyl-6-methyl-8-oxo-1-N-(2-phenylethyl)-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C25H31N5O3
    (6S)-6-N-cyclopentyl-7-cyclopropyl-6-methyl-8-oxo-1-N-(2-phenylethyl)-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6R)-1-N,7-dicyclopropyl-6-methyl-6-N-[(4-methylphenyl)methyl]-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C23H27N5O3
    (6R)-1-N,7-dicyclopropyl-6-methyl-6-N-[(4-methylphenyl)methyl]-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6S)-7-cyclopropyl-6-N-(2-methoxyethyl)-6-methyl-8-oxo-1-N-[3-(trifluoromethyl)phenyl]-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C22H24F3N5O4
    (6S)-7-cyclopropyl-6-N-(2-methoxyethyl)-6-methyl-8-oxo-1-N-[3-(trifluoromethyl)phenyl]-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6S)-6-N-cyclopentyl-7-cyclopropyl-1-N-[(4-fluorophenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C24H28FN5O3
    (6S)-6-N-cyclopentyl-7-cyclopropyl-1-N-[(4-fluorophenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6R)-7-cyclopropyl-6-N-[(4-fluorophenyl)methyl]-1-N-[(3-methoxyphenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C27H28FN5O4
    (6R)-7-cyclopropyl-6-N-[(4-fluorophenyl)methyl]-1-N-[(3-methoxyphenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6R)-1-N-[2-(4-chlorophenyl)ethyl]-6-N-cyclopentyl-7-cyclopropyl-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C25H30ClN5O3
    (6R)-1-N-[2-(4-chlorophenyl)ethyl]-6-N-cyclopentyl-7-cyclopropyl-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6S)-6-N-cyclopentyl-7-cyclopropyl-1-N-[(2-fluorophenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C24H28FN5O3
    (6S)-6-N-cyclopentyl-7-cyclopropyl-1-N-[(2-fluorophenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6R)-7-cyclopropyl-6-N-[(4-methoxyphenyl)methyl]-6-methyl-8-oxo-1-N-(2-thiophen-2-ylethyl)-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C26H29N5O4S
    (6R)-7-cyclopropyl-6-N-[(4-methoxyphenyl)methyl]-6-methyl-8-oxo-1-N-(2-thiophen-2-ylethyl)-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide
    —— (6R)-7-cyclopropyl-1-N-(2-ethylphenyl)-6-N-[(4-methoxyphenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide —— C28H31N5O4
    (6R)-7-cyclopropyl-1-N-(2-ethylphenyl)-6-N-[(4-methoxyphenyl)methyl]-6-methyl-8-oxo-5H-imidazo[1,5-a]pyrazine-1,6-dicarboxamide