![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-[(1-phenylcyclobutyl)methyl]urea](http://zinc12.docking.org/img/rings/212974.gif)
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![2,4-diketo-N-[(5-phenyl-2-furyl)methyl]-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/124160.gif)
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![2-benzyl-N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)pyrrolidine-1-carboxamide](http://zinc12.docking.org/img/rings/212982.gif)
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![6-(4-benzylpiperazine-1-carbonyl)-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/123161.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-4-(pyrrolidinomethyl)benzamide](http://zinc12.docking.org/img/rings/538561.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-4-phenyl-piperidine-1-carboxamide](http://zinc12.docking.org/img/rings/212910.gif)
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![N-[2-(cyclohexylamino)ethyl]-1-cyclopropyl-2,4-diketo-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/248565.gif)
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![1-cyclopropyl-2,4-diketo-N-(3-phenylpropyl)pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/327426.gif)
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![2,4-diketo-1H-pyrido[2,3-d]pyrimidine-7-carboxylic Acid (2-phenylphenyl) Ester](http://zinc12.docking.org/img/rings/500877.gif)
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![2,4-diketo-N-(3-phenylphenyl)-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/124150.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-5-yl)-4-phenyl-benzamide](http://zinc12.docking.org/img/rings/111381.gif)
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![6-[4-(1H-pyrrol-3-ylsulfonyl)piperazine-1-carbonyl]-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/124079.gif)
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![2,4-diketo-N-[4-(2-pyrimidylthio)phenyl]-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/131837.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-2-(thiazol-4-ylmethylthio)benzamide](http://zinc12.docking.org/img/rings/190067.gif)
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![1-cyclopropyl-2,4-diketo-N'-(2-phenylacetyl)pyrido[2,3-d]pyrimidine-6-carbohydrazide](http://zinc12.docking.org/img/rings/359901.gif)
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![5-[[2-keto-2-(4-phenylpiperazino)ethyl]thio]-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/143611.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-(5-phenyloxazol-2-yl)propionamide](http://zinc12.docking.org/img/rings/186868.gif)
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![N-[3-(cyclopropanecarbonylamino)benzyl]-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/131094.gif)
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![2,4-diketo-N-(2-phenoxyphenyl)-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/128273.gif)
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![2,4-diketo-N-(2-phenoxyphenyl)-1H-pyrido[2,3-d]pyrimidine-7-carboxamide](http://zinc12.docking.org/img/rings/379511.gif)
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![2,4-diketo-N-(2-phenyl-2-pyrrolidino-ethyl)-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/125403.gif)
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![2,4-diketo-N-(4-phenoxyphenyl)-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/124134.gif)
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![2,4-diketo-N-[2-(phenylthio)phenyl]-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/131399.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-2-(phenylthio)benzamide](http://zinc12.docking.org/img/rings/357718.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-(5-phenyl-2-thienyl)acrylamide](http://zinc12.docking.org/img/rings/189961.gif)
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![N-[3-(cyclohexylamino)propyl]-1-cyclopropyl-2,4-diketo-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/359623.gif)
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![1-benzyl-2,4-diketo-N-phenyl-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/574615.gif)
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![2-(2,4-diketo-1-phenyl-pyrido[2,3-d]pyrimidin-3-yl)-N-phenyl-acetamide](http://zinc12.docking.org/img/rings/100367.gif)
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![6-(4-phenethylpiperidine-1-carbonyl)-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/124109.gif)
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![N-(3-benzylphenyl)-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/131053.gif)
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![5-(3,3-diphenylpropylamino)-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/125627.gif)
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![6-(4-besylpiperazine-1-carbonyl)-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/107816.gif)
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![N'-(2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-carbonyl)-2-phenyl-thiazole-5-carbohydrazide](http://zinc12.docking.org/img/rings/123949.gif)
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![2,4-diketo-N'-(5-phenylthiophene-2-carbonyl)-1H-pyrido[2,3-d]pyrimidine-6-carbohydrazide](http://zinc12.docking.org/img/rings/124064.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-[4-(2-ketopyrrolidino)phenyl]acrylamide](http://zinc12.docking.org/img/rings/186870.gif)
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![3-benzoxy-N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)benzamide](http://zinc12.docking.org/img/rings/192967.gif)
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![5-[[2-(4-benzylpiperidino)-2-keto-ethyl]thio]-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/143612.gif)
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![N-(benzhydrylideneamino)-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/123852.gif)
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![1-cyclopropyl-2,4-diketo-N-(5-phenylpentyl)pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/596405.gif)
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![2,4-diketo-1-phenethyl-N-phenyl-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/574653.gif)
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![N-(2,2-diphenylethyl)-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/131008.gif)
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![N-(2,5-diketo-4-phenethyl-imidazolidin-1-yl)-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-7-carboxamide](http://zinc12.docking.org/img/rings/145297.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-[2-(thiazol-4-ylmethoxy)phenyl]acrylamide](http://zinc12.docking.org/img/rings/186873.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-[3-(thiazol-4-ylmethoxy)phenyl]acrylamide](http://zinc12.docking.org/img/rings/186872.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-[4-(thiazol-4-ylmethoxy)phenyl]acrylamide](http://zinc12.docking.org/img/rings/186874.gif)
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