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    —— ethyl (3S)-1-[(5R,6S)-6-cyano-5-(3-methoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-3-carboxylate —— C23H25N5O5
    ethyl (3S)-1-[(5R,6S)-6-cyano-5-(3-methoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-3-carboxylate
    —— ethyl (3R)-1-[(5S,6S)-6-cyano-5-[(1R)-cyclohex-3-en-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-3-carboxylate —— C22H27N5O4
    ethyl (3R)-1-[(5S,6S)-6-cyano-5-[(1R)-cyclohex-3-en-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-3-carboxylate
    —— ethyl (3S)-1-[(5S,6R)-6-cyano-5-(4-ethoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-3-carboxylate —— C24H27N5O5
    ethyl (3S)-1-[(5S,6R)-6-cyano-5-(4-ethoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-3-carboxylate
    —— ethyl (3S)-1-[(5R,6S)-6-cyano-4,7-dioxo-5-pyridin-4-yl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-3-carboxylate —— C21H22N6O4
    ethyl (3S)-1-[(5R,6S)-6-cyano-4,7-dioxo-5-pyridin-4-yl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-3-carboxylate
    —— ethyl (3S)-1-[(5S,6S)-6-cyano-5-(2-fluoro-5-nitrophenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-3-carboxylate —— C22H21FN6O6
    ethyl (3S)-1-[(5S,6S)-6-cyano-5-(2-fluoro-5-nitrophenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-3-carboxylate
    —— ethyl (3S)-1-[(5S,6S)-6-cyano-4,7-dioxo-5-(4-propoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-3-carboxylate —— C25H29N5O5
    ethyl (3S)-1-[(5S,6S)-6-cyano-4,7-dioxo-5-(4-propoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-3-carboxylate
    —— ethyl (3R)-1-[(5R,6S)-6-cyano-4,7-dioxo-5-(4-phenylmethoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-3-carboxylate —— C29H29N5O5
    ethyl (3R)-1-[(5R,6S)-6-cyano-4,7-dioxo-5-(4-phenylmethoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-3-carboxylate
    —— ethyl (3R)-1-[(5R,6S)-6-cyano-5-(2,4-dimethoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-3-carboxylate —— C24H27N5O6
    ethyl (3R)-1-[(5R,6S)-6-cyano-5-(2,4-dimethoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-3-carboxylate
    —— ethyl (3S)-1-[(5R,6S)-6-cyano-4,7-dioxo-5-(4-propoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-3-carboxylate —— C25H29N5O5
    ethyl (3S)-1-[(5R,6S)-6-cyano-4,7-dioxo-5-(4-propoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-3-carboxylate
    —— ethyl (3S)-1-[(5R,6S)-6-cyano-5-(2-ethoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-3-carboxylate —— C24H27N5O5
    ethyl (3S)-1-[(5R,6S)-6-cyano-5-(2-ethoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-3-carboxylate
    —— ethyl (3R)-1-[(5R,6S)-6-cyano-4,7-dioxo-5-phenyl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-3-carboxylate —— C22H23N5O4
    ethyl (3R)-1-[(5R,6S)-6-cyano-4,7-dioxo-5-phenyl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-3-carboxylate
    —— ethyl (3S)-1-[(5R,6S)-6-cyano-5-(2-methoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-3-carboxylate —— C23H25N5O5
    ethyl (3S)-1-[(5R,6S)-6-cyano-5-(2-methoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-3-carboxylate
    —— ethyl (3S)-1-[(5R,6S)-6-cyano-5-(2,5-dimethoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-3-carboxylate —— C24H27N5O6
    ethyl (3S)-1-[(5R,6S)-6-cyano-5-(2,5-dimethoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-3-carboxylate
    —— ethyl (3S)-1-[(5R,6S)-6-cyano-4,7-dioxo-5-(2,3,4-trimethoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-3-carboxylate —— C25H29N5O7
    ethyl (3S)-1-[(5R,6S)-6-cyano-4,7-dioxo-5-(2,3,4-trimethoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-3-carboxylate
    —— ethyl (3S)-1-[(5S,6R)-6-cyano-4,7-dioxo-5-(4-propoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-3-carboxylate —— C25H29N5O5
    ethyl (3S)-1-[(5S,6R)-6-cyano-4,7-dioxo-5-(4-propoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-3-carboxylate
    —— ethyl 1-[(5S,6S)-6-cyano-5-(3-methoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C23H25N5O5
    ethyl 1-[(5S,6S)-6-cyano-5-(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-4,7-dioxo-5-(2-prop-2-enoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C25H27N5O5
    ethyl 1-[(5S,6S)-6-cyano-4,7-dioxo-5-(2-prop-2-enoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5R,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-[(5R,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,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-[(5S,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-(4-chlorophenyl)-6-cyano-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C22H22ClN5O4
    ethyl 1-[(5S,6S)-5-(4-chlorophenyl)-6-cyano-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-(4-propan-2-ylphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C25H29N5O4
    ethyl 1-[(5R,6R)-6-cyano-4,7-dioxo-5-(4-propan-2-ylphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5R,6R)-5-(4-bromophenyl)-6-cyano-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C22H22BrN5O4
    ethyl 1-[(5R,6R)-5-(4-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-(3-ethoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C24H27N5O5
    ethyl 1-[(5S,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-methylphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C23H25N5O4
    ethyl 1-[(5S,6R)-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-[(E)-2-phenylethenyl]-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C24H25N5O4
    ethyl 1-[(5S,6S)-6-cyano-4,7-dioxo-5-[(E)-2-phenylethenyl]-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5R,6S)-6-cyano-5-[(1R)-cyclohex-3-en-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C22H27N5O4
    ethyl 1-[(5R,6S)-6-cyano-5-[(1R)-cyclohex-3-en-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-(3,4,5-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-(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-phenyl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C22H23N5O4
    ethyl 1-[(5S,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,6R)-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-[(5R,6R)-6-cyano-5-(4-ethylphenyl)-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-pyridin-4-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-4-yl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5S,6R)-6-cyano-4,7-dioxo-5-[(E)-2-phenylethenyl]-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C24H25N5O4
    ethyl 1-[(5S,6R)-6-cyano-4,7-dioxo-5-[(E)-2-phenylethenyl]-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5S,6R)-6-cyano-5-[4-(3-methylbutoxy)phenyl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C27H33N5O5
    ethyl 1-[(5S,6R)-6-cyano-5-[4-(3-methylbutoxy)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-(4-methylphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C23H25N5O4
    ethyl 1-[(5R,6R)-6-cyano-5-(4-methylphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5R,6S)-5-(4-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-(4-bromophenyl)-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-[4-(dimethylamino)phenyl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C24H28N6O4
    ethyl 1-[(5R,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,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-[(5S,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-[(5R,6R)-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,6R)-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-[(5R,6S)-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-[(5R,6S)-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-[(5R,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-[(5R,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-5-(4-methylphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C23H25N5O4
    ethyl 1-[(5R,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-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,6S)-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-[(5R,6S)-6-cyano-5-(4-fluorophenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C22H22FN5O4
    ethyl 1-[(5R,6S)-6-cyano-5-(4-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-(4-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-(4-nitrophenyl)-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-methoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C23H25N5O5
    ethyl 1-[(5R,6S)-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,6R)-6-cyano-5-(4-fluorophenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C22H22FN5O4
    ethyl 1-[(5R,6R)-6-cyano-5-(4-fluorophenyl)-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-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-(4-ethoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5S,6S)-5-(4-bromophenyl)-6-cyano-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C22H22BrN5O4
    ethyl 1-[(5S,6S)-5-(4-bromophenyl)-6-cyano-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate
    —— ethyl 1-[(5S,6R)-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-[(5S,6R)-5-(3-chlorophenyl)-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-(3,5-difluorophenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C22H21F2N5O4
    ethyl 1-[(5S,6S)-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-(4-nitrophenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate —— C22H22N6O6
    ethyl 1-[(5S,6S)-6-cyano-5-(4-nitrophenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidin-2-yl]piperidine-4-carboxylate