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    —— (5R,6S)-5-(4-chlorophenyl)-2-[(2R,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C21H22ClN5O2
    (5R,6S)-5-(4-chlorophenyl)-2-[(2R,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-2-[(2S,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-5-pyridin-3-yl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C20H22N6O2
    (5R,6S)-2-[(2S,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-5-pyridin-3-yl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-5-(3,4-dimethoxyphenyl)-2-[(2R,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C23H27N5O4
    (5R,6S)-5-(3,4-dimethoxyphenyl)-2-[(2R,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-5-(3-bromophenyl)-2-[(2S,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C21H22BrN5O2
    (5R,6S)-5-(3-bromophenyl)-2-[(2S,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5S,6S)-2-[(2R,6R)-2,6-dimethylpiperidin-1-yl]-5-(furan-2-yl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C19H21N5O3
    (5S,6S)-2-[(2R,6R)-2,6-dimethylpiperidin-1-yl]-5-(furan-2-yl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-2-[(2R,6S)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-5-phenyl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C21H23N5O2
    (5R,6S)-2-[(2R,6S)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-5-phenyl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5S,6S)-5-(2-chloro-6-fluorophenyl)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C21H21ClFN5O2
    (5S,6S)-5-(2-chloro-6-fluorophenyl)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-2-[(2R,6R)-2,6-dimethylpiperidin-1-yl]-5-(4-methylsulfanylphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C22H25N5O2S
    (5R,6S)-2-[(2R,6R)-2,6-dimethylpiperidin-1-yl]-5-(4-methylsulfanylphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-2-[(2S,6R)-2,6-dimethylpiperidin-1-yl]-5-(4-methylsulfanylphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C22H25N5O2S
    (5R,6S)-2-[(2S,6R)-2,6-dimethylpiperidin-1-yl]-5-(4-methylsulfanylphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-5-(4-methylsulfanylphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C22H25N5O2S
    (5R,6S)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-5-(4-methylsulfanylphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-2-[(2R,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-5-pyridin-3-yl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C20H22N6O2
    (5R,6S)-2-[(2R,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-5-pyridin-3-yl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-2-[(2S,6R)-2,6-dimethylpiperidin-1-yl]-5-(2-methoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C22H25N5O3
    (5R,6S)-2-[(2S,6R)-2,6-dimethylpiperidin-1-yl]-5-(2-methoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-5-(3-bromophenyl)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C21H22BrN5O2
    (5R,6S)-5-(3-bromophenyl)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5S,6S)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-5-(2-fluorophenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C21H22FN5O2
    (5S,6S)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-5-(2-fluorophenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-5-pyridin-4-yl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C20H22N6O2
    (5R,6S)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-5-pyridin-4-yl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-2-[(2S)-2-ethylpiperidin-1-yl]-4,7-dioxo-5-(2,3,4-trimethoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C24H29N5O5
    (5R,6S)-2-[(2S)-2-ethylpiperidin-1-yl]-4,7-dioxo-5-(2,3,4-trimethoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-5-pyridin-3-yl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C20H22N6O2
    (5R,6S)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-5-pyridin-3-yl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5S,6S)-5-(2-chlorophenyl)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C21H22ClN5O2
    (5S,6S)-5-(2-chlorophenyl)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5S,6S)-5-(2-chloro-5-nitrophenyl)-2-[(2R,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C21H21ClN6O4
    (5S,6S)-5-(2-chloro-5-nitrophenyl)-2-[(2R,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-5-[4-(dimethylamino)phenyl]-2-[(2S,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C23H28N6O2
    (5R,6S)-5-[4-(dimethylamino)phenyl]-2-[(2S,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-2-[(2S,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-5-(3,4,5-trimethoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C24H29N5O5
    (5R,6S)-2-[(2S,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-5-(3,4,5-trimethoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-2-[(2R,6R)-2,6-dimethylpiperidin-1-yl]-5-(2-nitrophenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C21H22N6O4
    (5R,6S)-2-[(2R,6R)-2,6-dimethylpiperidin-1-yl]-5-(2-nitrophenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-5-(4-bromophenyl)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C21H22BrN5O2
    (5R,6S)-5-(4-bromophenyl)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5S,6S)-5-(2-chlorophenyl)-2-[(2S,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C21H22ClN5O2
    (5S,6S)-5-(2-chlorophenyl)-2-[(2S,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-5-(2,3-dimethoxyphenyl)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C23H27N5O4
    (5R,6S)-5-(2,3-dimethoxyphenyl)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5S,6S)-2-[(2S,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-5-pyridin-2-yl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C20H22N6O2
    (5S,6S)-2-[(2S,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-5-pyridin-2-yl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-5-(3-bromophenyl)-2-[(2R,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C21H22BrN5O2
    (5R,6S)-5-(3-bromophenyl)-2-[(2R,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-5-[4-(dimethylamino)phenyl]-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C23H28N6O2
    (5R,6S)-5-[4-(dimethylamino)phenyl]-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5S,6R)-5-[4-(diethylamino)phenyl]-2-[(2S,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C25H32N6O2
    (5S,6R)-5-[4-(diethylamino)phenyl]-2-[(2S,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-2-[(2S,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-5-(2,3,4-trimethoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C24H29N5O5
    (5R,6S)-2-[(2S,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-5-(2,3,4-trimethoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5S,6S)-2-[(2R,6S)-2,6-dimethylpiperidin-1-yl]-5-(3-ethoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C23H27N5O3
    (5S,6S)-2-[(2R,6S)-2,6-dimethylpiperidin-1-yl]-5-(3-ethoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-2-[(2R,6S)-2,6-dimethylpiperidin-1-yl]-5-(2-hydroxynaphthalen-1-yl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C25H25N5O3
    (5R,6S)-2-[(2R,6S)-2,6-dimethylpiperidin-1-yl]-5-(2-hydroxynaphthalen-1-yl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-5-(2-methoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C22H25N5O3
    (5R,6S)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-5-(2-methoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5S,6S)-2-[(2R,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-5-pyridin-2-yl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C20H22N6O2
    (5S,6S)-2-[(2R,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-5-pyridin-2-yl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5S,6S)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-5-pyridin-2-yl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C20H22N6O2
    (5S,6S)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-5-pyridin-2-yl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-5-(2,4,5-trimethoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C24H29N5O5
    (5R,6S)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-5-(2,4,5-trimethoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-5-(2-nitrophenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C21H22N6O4
    (5R,6S)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-5-(2-nitrophenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-2-[(2S,6R)-2,6-dimethylpiperidin-1-yl]-5-(3-nitrophenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C21H22N6O4
    (5R,6S)-2-[(2S,6R)-2,6-dimethylpiperidin-1-yl]-5-(3-nitrophenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-2-[(2R,6R)-2,6-dimethylpiperidin-1-yl]-5-(2-hydroxynaphthalen-1-yl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C25H25N5O3
    (5R,6S)-2-[(2R,6R)-2,6-dimethylpiperidin-1-yl]-5-(2-hydroxynaphthalen-1-yl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-2-[(2R,6S)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-5-(3-phenoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C27H27N5O3
    (5R,6S)-2-[(2R,6S)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-5-(3-phenoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-2-[(2R,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-5-(2,4,5-trimethoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C24H29N5O5
    (5R,6S)-2-[(2R,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-5-(2,4,5-trimethoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-5-(2-hydroxynaphthalen-1-yl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C25H25N5O3
    (5R,6S)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-5-(2-hydroxynaphthalen-1-yl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-5-(3-methoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C22H25N5O3
    (5R,6S)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-5-(3-methoxyphenyl)-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— 5-(4-Methoxyphenyl)-4-methyl-2-[[methyl-[(4-propan-2-ylphenyl)methyl]amino]methyl]-1,2,4-triazole-3-thione —— C22H28N4OS
    5-(4-Methoxyphenyl)-4-methyl-2-[[methyl-[(4-propan-2-ylphenyl)methyl]amino]methyl]-1,2,4-triazole-3-thione
    —— (5R,6S)-5-(2,4-dimethoxyphenyl)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C23H27N5O4
    (5R,6S)-5-(2,4-dimethoxyphenyl)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-5-(2,5-dimethoxyphenyl)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C23H27N5O4
    (5R,6S)-5-(2,5-dimethoxyphenyl)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-2-[(2R,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-5-phenyl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C21H23N5O2
    (5R,6S)-2-[(2R,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-5-phenyl-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5S,6S)-5-(2,4-dichlorophenyl)-2-[(2S,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C21H21Cl2N5O2
    (5S,6S)-5-(2,4-dichlorophenyl)-2-[(2S,6R)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5R,6S)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-5-(2,3,4-trimethoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C24H29N5O5
    (5R,6S)-2-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-5-(2,3,4-trimethoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
    —— (5S,6R)-2-[(2R,6S)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-5-(4-propoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile —— C24H29N5O3
    (5S,6R)-2-[(2R,6S)-2,6-dimethylpiperidin-1-yl]-4,7-dioxo-5-(4-propoxyphenyl)-1,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile