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    —— ethyl 1-[(5S,6R)-6-cyano-4,7-dioxo-5-pyridin-2-yl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C21H22N6O4
    ethyl 1-[(5S,6R)-6-cyano-4,7-dioxo-5-pyridin-2-yl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5R,6R)-6-cyano-5-[4-(2-methylpropyl)phenyl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C26H31N5O4
    ethyl 1-[(5R,6R)-6-cyano-5-[4-(2-methylpropyl)phenyl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5S,6R)-5-(3-bromophenyl)-6-cyano-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C22H22BrN5O4
    ethyl 1-[(5S,6R)-5-(3-bromophenyl)-6-cyano-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5S,6R)-6-cyano-5-(2-hydroxy-3-methoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C23H25N5O6
    ethyl 1-[(5S,6R)-6-cyano-5-(2-hydroxy-3-methoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5S,6S)-6-cyano-5-(4-methylphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C23H25N5O4
    ethyl 1-[(5S,6S)-6-cyano-5-(4-methylphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5S,6S)-6-cyano-4,7-dioxo-5-(4-phenylmethoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C29H29N5O5
    ethyl 1-[(5S,6S)-6-cyano-4,7-dioxo-5-(4-phenylmethoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5S,6R)-6-cyano-5-(1H-indol-3-yl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C24H24N6O4
    ethyl 1-[(5S,6R)-6-cyano-5-(1H-indol-3-yl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5R,6R)-6-cyano-5-(3,5-difluorophenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C22H21F2N5O4
    ethyl 1-[(5R,6R)-6-cyano-5-(3,5-difluorophenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5S,6S)-6-cyano-5-(3-ethoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C24H27N5O5
    ethyl 1-[(5S,6S)-6-cyano-5-(3-ethoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5R,6S)-6-cyano-4,7-dioxo-5-(4-phenylmethoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C29H29N5O5
    ethyl 1-[(5R,6S)-6-cyano-4,7-dioxo-5-(4-phenylmethoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5R,6S)-6-cyano-4,7-dioxo-5-phenyl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C22H23N5O4
    ethyl 1-[(5R,6S)-6-cyano-4,7-dioxo-5-phenyl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5R,6S)-6-cyano-5-[4-(2-methylpropyl)phenyl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C26H31N5O4
    ethyl 1-[(5R,6S)-6-cyano-5-[4-(2-methylpropyl)phenyl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5R,6R)-6-cyano-5-(3-ethoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C24H27N5O5
    ethyl 1-[(5R,6R)-6-cyano-5-(3-ethoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5S,6R)-6-cyano-5-[4-(2-methylpropyl)phenyl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C26H31N5O4
    ethyl 1-[(5S,6R)-6-cyano-5-[4-(2-methylpropyl)phenyl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5R,6S)-6-cyano-5-(4-ethoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C24H27N5O5
    ethyl 1-[(5R,6S)-6-cyano-5-(4-ethoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5S,6S)-6-cyano-5-(3-methylphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C23H25N5O4
    ethyl 1-[(5S,6S)-6-cyano-5-(3-methylphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5R,6R)-6-cyano-5-naphthalen-1-yl-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C26H25N5O4
    ethyl 1-[(5R,6R)-6-cyano-5-naphthalen-1-yl-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5R,6R)-6-cyano-5-(4-methoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C23H25N5O5
    ethyl 1-[(5R,6R)-6-cyano-5-(4-methoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5R,6S)-6-cyano-4,7-dioxo-5-(3-phenoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C28H27N5O5
    ethyl 1-[(5R,6S)-6-cyano-4,7-dioxo-5-(3-phenoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5S,6S)-5-(2-chloro-5-nitrophenyl)-6-cyano-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C22H21ClN6O6
    ethyl 1-[(5S,6S)-5-(2-chloro-5-nitrophenyl)-6-cyano-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5S,6S)-6-cyano-5-[4-(diethylamino)phenyl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C26H32N6O4
    ethyl 1-[(5S,6S)-6-cyano-5-[4-(diethylamino)phenyl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5S,6R)-6-cyano-5-(2-nitrophenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C22H22N6O6
    ethyl 1-[(5S,6R)-6-cyano-5-(2-nitrophenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5S,6R)-6-cyano-5-(2-fluoro-5-nitrophenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C22H21FN6O6
    ethyl 1-[(5S,6R)-6-cyano-5-(2-fluoro-5-nitrophenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5S,6R)-6-cyano-4,7-dioxo-5-(3-phenoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C28H27N5O5
    ethyl 1-[(5S,6R)-6-cyano-4,7-dioxo-5-(3-phenoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5S,6S)-6-cyano-5-(2-fluorophenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C22H22FN5O4
    ethyl 1-[(5S,6S)-6-cyano-5-(2-fluorophenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5S,6R)-6-cyano-5-(3-nitrophenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C22H22N6O6
    ethyl 1-[(5S,6R)-6-cyano-5-(3-nitrophenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5S,6R)-6-cyano-4,7-dioxo-5-(2,4,5-trimethoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C25H29N5O7
    ethyl 1-[(5S,6R)-6-cyano-4,7-dioxo-5-(2,4,5-trimethoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5R,6R)-6-cyano-5-(2,4-dichlorophenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C22H21Cl2N5O4
    ethyl 1-[(5R,6R)-6-cyano-5-(2,4-dichlorophenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5S,6R)-5-(2-chloro-5-nitrophenyl)-6-cyano-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C22H21ClN6O6
    ethyl 1-[(5S,6R)-5-(2-chloro-5-nitrophenyl)-6-cyano-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5R,6S)-5-(3-chlorophenyl)-6-cyano-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C22H22ClN5O4
    ethyl 1-[(5R,6S)-5-(3-chlorophenyl)-6-cyano-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5R,6S)-6-cyano-5-(2-hydroxynaphthalen-1-yl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C26H25N5O5
    ethyl 1-[(5R,6S)-6-cyano-5-(2-hydroxynaphthalen-1-yl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5R,6R)-6-cyano-4,7-dioxo-5-(3-phenoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C28H27N5O5
    ethyl 1-[(5R,6R)-6-cyano-4,7-dioxo-5-(3-phenoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5R,6R)-6-cyano-4,7-dioxo-5-pyridin-2-yl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C21H22N6O4
    ethyl 1-[(5R,6R)-6-cyano-4,7-dioxo-5-pyridin-2-yl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5S,6S)-6-cyano-5-[4-(dimethylamino)phenyl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C24H28N6O4
    ethyl 1-[(5S,6S)-6-cyano-5-[4-(dimethylamino)phenyl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5S,6S)-6-cyano-5-(2-hydroxynaphthalen-1-yl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C26H25N5O5
    ethyl 1-[(5S,6S)-6-cyano-5-(2-hydroxynaphthalen-1-yl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5S,6S)-6-cyano-4,7-dioxo-5-(2,4,5-trimethoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C25H29N5O7
    ethyl 1-[(5S,6S)-6-cyano-4,7-dioxo-5-(2,4,5-trimethoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5R,6S)-6-cyano-5-(2,4-dichlorophenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C22H21Cl2N5O4
    ethyl 1-[(5R,6S)-6-cyano-5-(2,4-dichlorophenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5S,6S)-6-cyano-5-(4-ethylphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C24H27N5O4
    ethyl 1-[(5S,6S)-6-cyano-5-(4-ethylphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5R,6S)-6-cyano-4,7-dioxo-5-(3,4,5-trimethoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C25H29N5O7
    ethyl 1-[(5R,6S)-6-cyano-4,7-dioxo-5-(3,4,5-trimethoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5S,6S)-6-cyano-4,7-dioxo-5-pyridin-3-yl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C21H22N6O4
    ethyl 1-[(5S,6S)-6-cyano-4,7-dioxo-5-pyridin-3-yl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5S,6R)-6-cyano-5-(2,4-dichlorophenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C22H21Cl2N5O4
    ethyl 1-[(5S,6R)-6-cyano-5-(2,4-dichlorophenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5R,6R)-5-(2-chloro-6-fluorophenyl)-6-cyano-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C22H21ClFN5O4
    ethyl 1-[(5R,6R)-5-(2-chloro-6-fluorophenyl)-6-cyano-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5S,6S)-6-cyano-4,7-dioxo-5-pyridin-4-yl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C21H22N6O4
    ethyl 1-[(5S,6S)-6-cyano-4,7-dioxo-5-pyridin-4-yl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5R,6R)-6-cyano-5-(3,4-dimethoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C24H27N5O6
    ethyl 1-[(5R,6R)-6-cyano-5-(3,4-dimethoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5R,6R)-6-cyano-5-(furan-2-yl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C20H21N5O5
    ethyl 1-[(5R,6R)-6-cyano-5-(furan-2-yl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5R,6S)-6-cyano-5-(3,4-dimethoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C24H27N5O6
    ethyl 1-[(5R,6S)-6-cyano-5-(3,4-dimethoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5S,6S)-6-cyano-5-(2,4-dimethoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C24H27N5O6
    ethyl 1-[(5S,6S)-6-cyano-5-(2,4-dimethoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5R,6S)-6-cyano-4,7-dioxo-5-pyridin-3-yl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C21H22N6O4
    ethyl 1-[(5R,6S)-6-cyano-4,7-dioxo-5-pyridin-3-yl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5S,6R)-6-cyano-5-(3,4-dimethoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C24H27N5O6
    ethyl 1-[(5S,6R)-6-cyano-5-(3,4-dimethoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5R,6S)-5-(3-bromophenyl)-6-cyano-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C22H22BrN5O4
    ethyl 1-[(5R,6S)-5-(3-bromophenyl)-6-cyano-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate