![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-(2-norbornyl)urea](http://zinc12.docking.org/img/rings/212808.gif)
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![5-(2,3-dihydro-1,4-benzodioxin-6-ylamino)-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/95706.gif)
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![5-(piperonylamino)-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/95533.gif)
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![N-(1,3-benzothiazol-2-yl)-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/124084.gif)
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![N-(1,3-benzoxazol-5-yl)-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/191819.gif)
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![N-(1H-indazol-7-yl)-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/344436.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-5-yl)-piperonylamide](http://zinc12.docking.org/img/rings/111367.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-6,7-dihydro-4H-thieno[3,2-c]pyridine-5-carboxamide](http://zinc12.docking.org/img/rings/212925.gif)
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![2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-carboxylic Acid Coumaran-7-yl Ester](http://zinc12.docking.org/img/rings/476173.gif)
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![2,4-diketo-1H-pyrido[2,3-d]pyrimidine-7-carboxylic Acid Coumaran-7-yl Ester](http://zinc12.docking.org/img/rings/476176.gif)
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![N-(1H-indol-5-yl)-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-7-carboxamide](http://zinc12.docking.org/img/rings/388164.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-5-yl)coumarilamide](http://zinc12.docking.org/img/rings/111391.gif)
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![5-[2-(1H-indol-3-yl)ethylamino]-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/125629.gif)
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![6-(3,4-dihydro-2H-quinoline-1-carbonyl)-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/346163.gif)
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![7-(3,4,4a,5,6,7,8,8a-octahydro-2H-quinoline-1-carbonyl)-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/553572.gif)
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![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-(imidazo[2,1-b]thiazol-6-ylmethyl)urea](http://zinc12.docking.org/img/rings/212926.gif)
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![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-(4,5,6,7-tetrahydro-1H-indazol-4-yl)urea](http://zinc12.docking.org/img/rings/212941.gif)
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![2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-carboxylic Acid Piperonyl Ester](http://zinc12.docking.org/img/rings/382135.gif)
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![2,4-diketo-1H-pyrido[2,3-d]pyrimidine-7-carboxylic Acid Piperonyl Ester](http://zinc12.docking.org/img/rings/382116.gif)
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![6-(3,4-dihydro-2H-quinolin-1-ylsulfonyl)-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/503481.gif)
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![N-(1H-benzimidazol-2-ylmethyl)-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/205591.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-2,3-dihydro-1,4-benzodioxine-5-carboxamide](http://zinc12.docking.org/img/rings/453532.gif)
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![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-indan-1-yl-urea](http://zinc12.docking.org/img/rings/212839.gif)
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![2,4-diketo-1H-pyrido[2,3-d]pyrimidine-7-carboxylic Acid 6-quinolyl Ester](http://zinc12.docking.org/img/rings/486131.gif)
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![2,4-diketo-N-(8-quinolyl)-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/337619.gif)
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![6-(1,2,3,5-tetrahydro-1,4-benzodiazepine-4-carbonyl)-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/161958.gif)
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![7-(1,2,3,5-tetrahydro-1,4-benzodiazepine-4-carbonyl)-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/161849.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-2-(1H-indol-3-yl)acetamide](http://zinc12.docking.org/img/rings/607656.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3,4-dihydro-1H-isoquinoline-2-carboxamide](http://zinc12.docking.org/img/rings/212831.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)quinoline-5-carboxamide](http://zinc12.docking.org/img/rings/186871.gif)
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![N-(benzofuran-2-ylmethyl)-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/145595.gif)
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![N-(benzothiophen-3-ylmethyl)-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/186130.gif)
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![2,4-diketo-1H-pyrido[2,3-d]pyrimidine-7-carboxylic Acid Tetralin-1-yl Ester](http://zinc12.docking.org/img/rings/303039.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-5-yl)-2-naphthamide](http://zinc12.docking.org/img/rings/111379.gif)
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![N-(indan-5-ylmethyl)-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/184407.gif)
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![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-([1,2,4]triazolo[4,3-a]pyridin-3-ylmethyl)urea](http://zinc12.docking.org/img/rings/212916.gif)
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![1-(1,3-benzothiazol-2-ylmethyl)-3-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)urea](http://zinc12.docking.org/img/rings/212890.gif)
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![1-(1H-benzimidazol-2-ylmethyl)-3-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)urea](http://zinc12.docking.org/img/rings/212930.gif)
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![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-piperonyl-urea](http://zinc12.docking.org/img/rings/212901.gif)
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![2,4-diketo-N-(3-keto-4H-1,4-benzoxazin-6-yl)-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/130244.gif)
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![N-(1,3-benzodioxol-5-yl)-2-[(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-5-yl)thio]acetamide](http://zinc12.docking.org/img/rings/143617.gif)
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![1-(benzofuran-2-ylmethyl)-3-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)urea](http://zinc12.docking.org/img/rings/212810.gif)
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![1-(benzothiophen-3-ylmethyl)-3-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)urea](http://zinc12.docking.org/img/rings/212830.gif)
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![1-(coumaran-2-ylmethyl)-3-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)urea](http://zinc12.docking.org/img/rings/212899.gif)
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![1-chroman-4-yl-3-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)urea](http://zinc12.docking.org/img/rings/212867.gif)
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![2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-carboxylic Acid 2,3-dihydro-1,4-benzodioxin-5-ylmethyl Ester](http://zinc12.docking.org/img/rings/335918.gif)
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![2,4-diketo-1H-pyrido[2,3-d]pyrimidine-7-carboxylic Acid 2,3-dihydro-1,4-benzodioxin-5-ylmethyl Ester](http://zinc12.docking.org/img/rings/335868.gif)
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![2,4-diketo-1H-pyrido[2,3-d]pyrimidine-7-carboxylic Acid 2,3-dihydro-1,4-benzodioxin-6-ylmethyl Ester](http://zinc12.docking.org/img/rings/383496.gif)
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![N-(2,3-dihydro-1,4-benzodioxin-5-ylmethyl)-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/458881.gif)
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![N-(2,3-dihydro-1,4-benzodioxin-6-ylmethyl)-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/123201.gif)
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