![5-(4-benzylpiperidino)-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/95476.gif)
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![2,4-diketo-N-[[3-(2-thienyl)-1H-1,2,4-triazol-5-yl]methyl]-1H-pyrido[2,3-d]pyrimidine-7-carboxamide](http://zinc12.docking.org/img/rings/290498.gif)
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![N-[[5-(2-furyl)-1,2,4-oxadiazol-3-yl]methyl]-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-7-carboxamide](http://zinc12.docking.org/img/rings/305341.gif)
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![1-cyclopropyl-2,4-diketo-N-[3-(1,2,4-oxadiazol-5-yl)propyl]pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/217496.gif)
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![1-cyclopropyl-N'-(3-furoyl)-2,4-diketo-pyrido[2,3-d]pyrimidine-6-carbohydrazide](http://zinc12.docking.org/img/rings/219949.gif)
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![2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-carboxylic Acid [3-(1,3,4-oxadiazol-2-yl)phenyl] Ester](http://zinc12.docking.org/img/rings/480538.gif)
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![2,4-diketo-N-[3-(1,3,4-oxadiazol-2-yl)phenyl]-1H-pyrido[2,3-d]pyrimidine-7-carboxamide](http://zinc12.docking.org/img/rings/183015.gif)
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![2,4-diketo-N-[[2-(2-thienyl)oxazol-4-yl]methyl]-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/124107.gif)
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![4-(cyclopropanecarbonyl)-N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)piperazine-1-carboxamide](http://zinc12.docking.org/img/rings/212892.gif)
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![7-cyclopropyl-2,4-diketo-N-[3-(1,2,4-oxadiazol-5-yl)propyl]-1H-pyrido[2,3-d]pyrimidine-5-carboxamide](http://zinc12.docking.org/img/rings/342162.gif)
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![7-cyclopropyl-N'-(3-furoyl)-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-5-carbohydrazide](http://zinc12.docking.org/img/rings/219872.gif)
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![1-cyclopropyl-2,4-diketo-N-(3-pyrazol-1-ylpropyl)pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/169721.gif)
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![1-cyclopropyl-3-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-1-(2-pyridylmethyl)urea](http://zinc12.docking.org/img/rings/212937.gif)
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![1-cyclopropyl-3-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-1-(4-pyridylmethyl)urea](http://zinc12.docking.org/img/rings/212952.gif)
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![2,4-diketo-N-(3-phenyl-1H-pyrazol-5-yl)-1H-pyrido[2,3-d]pyrimidine-7-carboxamide](http://zinc12.docking.org/img/rings/388355.gif)
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![2,4-diketo-N-(4-phenylthiazol-2-yl)-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/110409.gif)
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![6-(2-phenylpyrrolidino)sulfonyl-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/503477.gif)
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![7-(2-phenyliminothiazolidine-3-carbonyl)-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/379475.gif)
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![7-cyclopropyl-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-5-carboxylic Acid 3-(1H-pyrazol-4-yl)propyl Ester](http://zinc12.docking.org/img/rings/360180.gif)
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![7-[4-(2-thenyl)piperazine-1-carbonyl]-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/145189.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-1-phenyl-pyrazole-3-carboxamide](http://zinc12.docking.org/img/rings/559693.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-1-phenyl-pyrazole-4-carboxamide](http://zinc12.docking.org/img/rings/192029.gif)
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![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-[(1-phenylcyclopropyl)methyl]urea](http://zinc12.docking.org/img/rings/212975.gif)
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![1-benzyl-1-cyclopropyl-3-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)urea](http://zinc12.docking.org/img/rings/212985.gif)
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![1-cyclopropyl-2,4-diketo-N-[2-(2-pyridyl)ethyl]pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/216114.gif)
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![1-[cyclopropyl(phenyl)methyl]-3-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)urea](http://zinc12.docking.org/img/rings/212927.gif)
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![2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-carboxylic Acid [4-(cyclopropylmethoxy)phenyl] Ester](http://zinc12.docking.org/img/rings/345169.gif)
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![2,4-diketo-N-(4-phenyl-2-thienyl)-1H-pyrido[2,3-d]pyrimidine-7-carboxamide](http://zinc12.docking.org/img/rings/379507.gif)
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![5-(4-phenylpiperazine-1-carbonyl)-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/379466.gif)
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![6-(4-phenylpiperazine-1-carbonyl)-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/131028.gif)
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![7-(2-phenylmorpholine-4-carbonyl)-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/329299.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-2-phenyl-pyrrolidine-1-carboxamide](http://zinc12.docking.org/img/rings/212968.gif)
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![1-cyclopropyl-2,4-diketo-N-phenethyl-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/186709.gif)
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![5-(4-anilinoanilino)-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/95609.gif)
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![5-(4-phenoxyanilino)-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/95693.gif)
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![5-(benzhydrylamino)-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/125648.gif)
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![2,4-diketo-N-[[3-(3-pyridyl)-1,2,4-oxadiazol-5-yl]methyl]-1H-pyrido[2,3-d]pyrimidine-5-carboxamide](http://zinc12.docking.org/img/rings/262915.gif)
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![2,4-diketo-N-[(6-pyrazol-1-yl-3-pyridyl)methyl]-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/103529.gif)
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![6-(4-phenylpiperazino)sulfonyl-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/181827.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-4-(4-pyridyl)piperazine-1-carboxamide](http://zinc12.docking.org/img/rings/212938.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-6-(2-furyl)-2-keto-1H-pyridine-3-carboxamide](http://zinc12.docking.org/img/rings/443560.gif)
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![1-benzyl-N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)pyrazole-4-carboxamide](http://zinc12.docking.org/img/rings/186869.gif)
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![2,4-diketo-1H-pyrido[2,3-d]pyrimidine-7-carboxylic Acid [2-(cyclopropanecarbonylamino)phenyl] Ester](http://zinc12.docking.org/img/rings/501761.gif)
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![2,4-diketo-N-(4-piperazinophenyl)-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/124105.gif)
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![2,4-diketo-N-[(2-phenylthiazol-4-yl)methyl]-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/131171.gif)
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![7-(2-phenylimino-1,3-thiazinane-3-carbonyl)-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/379474.gif)
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![N'-benzoyl-1-cyclopropyl-2,4-diketo-pyrido[2,3-d]pyrimidine-6-carbohydrazide](http://zinc12.docking.org/img/rings/218250.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-4-phenyl-piperazine-1-carboxamide](http://zinc12.docking.org/img/rings/212902.gif)
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![N-(5-benzylthiazol-2-yl)-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/124156.gif)
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![N-[[2-(cyclopropylmethoxy)-4-pyridyl]methyl]-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-7-carboxamide](http://zinc12.docking.org/img/rings/517248.gif)
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