![2,4-diketo-N-[(5-thioxo-1,4-dihydro-1,2,4-triazol-3-yl)methyl]-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/462748.gif)
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![2,4-diketo-N-[(5-thioxo-1,4-dihydro-1,2,4-triazol-3-yl)methyl]-1H-pyrido[2,3-d]pyrimidine-7-carboxamide](http://zinc12.docking.org/img/rings/314003.gif)
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![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-(1H-pyrazol-4-ylmethyl)urea](http://zinc12.docking.org/img/rings/212943.gif)
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![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-(thiazol-2-ylmethyl)urea](http://zinc12.docking.org/img/rings/212969.gif)
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![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-(thiazol-5-ylmethyl)urea](http://zinc12.docking.org/img/rings/321542.gif)
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![2,4-diketo-N-(3-pyridyl)-1H-pyrido[2,3-d]pyrimidine-6-sulfonamide](http://zinc12.docking.org/img/rings/507869.gif)
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![2,4-diketo-N-(4-piperidyl)-1H-pyrido[2,3-d]pyrimidine-6-sulfonamide](http://zinc12.docking.org/img/rings/249086.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-2-keto-2-(1H-pyrazol-4-yl)acetamide](http://zinc12.docking.org/img/rings/189245.gif)
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![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-(2-furfuryl)urea](http://zinc12.docking.org/img/rings/212877.gif)
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![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-(2-thenyl)urea](http://zinc12.docking.org/img/rings/212826.gif)
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![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-(3-furfuryl)urea](http://zinc12.docking.org/img/rings/212815.gif)
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![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-(3-thenyl)urea](http://zinc12.docking.org/img/rings/212898.gif)
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![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-(4-piperidyl)urea](http://zinc12.docking.org/img/rings/212868.gif)
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![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-(pyrrolidin-3-ylmethyl)urea](http://zinc12.docking.org/img/rings/413257.gif)
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![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-(tetrahydrofurfuryl)urea](http://zinc12.docking.org/img/rings/212935.gif)
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![2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-sulfonic Acid Phenyl Ester](http://zinc12.docking.org/img/rings/394453.gif)
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![2,4-diketo-N-phenyl-1H-pyrido[2,3-d]pyrimidine-6-sulfonamide](http://zinc12.docking.org/img/rings/258401.gif)
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![N-[2-(1H-imidazol-2-yl)ethyl]-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-5-carboxamide](http://zinc12.docking.org/img/rings/343728.gif)
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![1-(cyclopentylmethyl)-3-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)urea](http://zinc12.docking.org/img/rings/212954.gif)
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![1-cyclohexyl-3-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)urea](http://zinc12.docking.org/img/rings/212806.gif)
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![2,4-diketo-N'-phenyl-1H-pyrido[2,3-d]pyrimidine-7-carbohydrazide](http://zinc12.docking.org/img/rings/193188.gif)
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![2,4-diketo-N-(2-pyridylmethyl)-1H-pyrido[2,3-d]pyrimidine-7-carboxamide](http://zinc12.docking.org/img/rings/615567.gif)
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![2,4-diketo-N-(3-piperidylmethyl)-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/288144.gif)
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![2,4-diketo-N-(3-piperidylmethyl)-1H-pyrido[2,3-d]pyrimidine-7-carboxamide](http://zinc12.docking.org/img/rings/345807.gif)
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![2,4-diketo-N-(4-piperidylmethyl)-1H-pyrido[2,3-d]pyrimidine-7-carboxamide](http://zinc12.docking.org/img/rings/505326.gif)
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![5-(3-morpholinopropylamino)-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/125643.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)azepane-1-carboxamide](http://zinc12.docking.org/img/rings/162567.gif)
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![2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/378818.gif)
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![2,4-diketo-1H-pyrido[2,3-d]pyrimidine-7-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/111727.gif)
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![2,4-diketo-1H-pyrido[2,3-d]pyrimidine-7-carboxylic Acid Cyclohexylmethyl Ester](http://zinc12.docking.org/img/rings/376655.gif)
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![2-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-3-yl)acetic Acid Cyclohexyl Ester](http://zinc12.docking.org/img/rings/557614.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-2-phenyl-acetamide](http://zinc12.docking.org/img/rings/456223.gif)
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![N-(cyclohexylmethyl)-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/457383.gif)
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![N-benzyl-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/123345.gif)
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![N-benzyl-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-7-carboxamide](http://zinc12.docking.org/img/rings/177362.gif)
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![5-(3-phenylpropylamino)-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/125626.gif)
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![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-[2-(1H-imidazol-2-yl)ethyl]urea](http://zinc12.docking.org/img/rings/472580.gif)
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![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-[2-(1H-pyrazol-4-yl)ethyl]urea](http://zinc12.docking.org/img/rings/212955.gif)
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![2,4-diketo-N'-(1H-pyrrole-2-carbonyl)-1H-pyrido[2,3-d]pyrimidine-6-carbohydrazide](http://zinc12.docking.org/img/rings/123938.gif)
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![2,4-diketo-N-[3-(1,2,4-oxadiazol-5-yl)propyl]-1H-pyrido[2,3-d]pyrimidine-7-carboxamide](http://zinc12.docking.org/img/rings/342180.gif)
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![N'-(3-furoyl)-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-5-carbohydrazide](http://zinc12.docking.org/img/rings/219873.gif)
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![N'-(3-furoyl)-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-carbohydrazide](http://zinc12.docking.org/img/rings/123328.gif)
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![N'-(3-furoyl)-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-7-carbohydrazide](http://zinc12.docking.org/img/rings/219884.gif)
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![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-(2-pyridylmethyl)urea](http://zinc12.docking.org/img/rings/212875.gif)
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![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-(3-pyridylmethyl)urea](http://zinc12.docking.org/img/rings/212802.gif)
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