![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-(4-pyridylmethyl)urea](http://zinc12.docking.org/img/rings/212798.gif)
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![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-[2-(2-furyl)ethyl]urea](http://zinc12.docking.org/img/rings/212860.gif)
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![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-[2-(2-thienyl)ethyl]urea](http://zinc12.docking.org/img/rings/212885.gif)
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![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-[2-(tetrahydrofuryl)ethyl]urea](http://zinc12.docking.org/img/rings/213011.gif)
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![2,4-diketo-1H-pyrido[2,3-d]pyrimidine-7-carboxylic Acid 3-(1H-pyrazol-4-yl)propyl Ester](http://zinc12.docking.org/img/rings/359976.gif)
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![2,4-diketo-N-(3-pyrazol-1-ylpropyl)-1H-pyrido[2,3-d]pyrimidine-5-carboxamide](http://zinc12.docking.org/img/rings/184536.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-2-(tetrahydrofurfuryloxy)acetamide](http://zinc12.docking.org/img/rings/456221.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-(2-ketopyrrolidino)propionamide](http://zinc12.docking.org/img/rings/607641.gif)
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![N-(cyclohexylmethyl)-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-sulfonamide](http://zinc12.docking.org/img/rings/485068.gif)
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![N-benzyl-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-sulfonamide](http://zinc12.docking.org/img/rings/180022.gif)
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![1-(cyclohex-3-en-1-ylmethyl)-3-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)urea](http://zinc12.docking.org/img/rings/304597.gif)
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![1-benzyl-3-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)urea](http://zinc12.docking.org/img/rings/162564.gif)
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![1-cycloheptyl-3-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)urea](http://zinc12.docking.org/img/rings/212979.gif)
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![2,4-diketo-N-(2-piperidinoethyl)-1H-pyrido[2,3-d]pyrimidine-5-carboxamide](http://zinc12.docking.org/img/rings/71785.gif)
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![2,4-diketo-N-[2-(2-pyridyl)ethyl]-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/216115.gif)
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![2-[(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-5-yl)thio]-N-phenyl-acetamide](http://zinc12.docking.org/img/rings/143620.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-2-phenoxy-acetamide](http://zinc12.docking.org/img/rings/294360.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-(2-pyridyl)propionamide](http://zinc12.docking.org/img/rings/294347.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)azocane-1-carboxamide](http://zinc12.docking.org/img/rings/212981.gif)
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![N-[3-(cyclopropylmethoxy)propyl]-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/112873.gif)
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![2,4-diketo-N-phenethyl-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/123354.gif)
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![2,4-diketo-N-phenethyl-1H-pyrido[2,3-d]pyrimidine-7-carboxamide](http://zinc12.docking.org/img/rings/433299.gif)
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![3-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-3-yl)-N-phenyl-propionamide](http://zinc12.docking.org/img/rings/332525.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-phenyl-acrylamide](http://zinc12.docking.org/img/rings/186876.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-phenyl-propionamide](http://zinc12.docking.org/img/rings/453536.gif)
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![N-(2-cyclohexylethyl)-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-7-carboxamide](http://zinc12.docking.org/img/rings/356247.gif)
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![N-cyclohexyl-3-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-3-yl)propionamide](http://zinc12.docking.org/img/rings/332526.gif)
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![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-[3-(1,2,4-oxadiazol-5-yl)propyl]urea](http://zinc12.docking.org/img/rings/528319.gif)
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![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-(2-keto-2-pyrrolidino-ethyl)urea](http://zinc12.docking.org/img/rings/213027.gif)
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![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-(2-morpholinoethyl)urea](http://zinc12.docking.org/img/rings/212865.gif)
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![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-(3-imidazol-1-ylpropyl)urea](http://zinc12.docking.org/img/rings/212973.gif)
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![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-(3-pyrazol-1-ylpropyl)urea](http://zinc12.docking.org/img/rings/212814.gif)
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![2,4-diketo-N-(2-keto-2-morpholino-ethyl)-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/338449.gif)
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![2,4-diketo-N-(2-keto-2-morpholino-ethyl)-1H-pyrido[2,3-d]pyrimidine-7-carboxamide](http://zinc12.docking.org/img/rings/299586.gif)
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![N-[2-[(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)amino]-2-keto-ethyl]thiophene-3-carboxamide](http://zinc12.docking.org/img/rings/528048.gif)
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![N-[2-[(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)carbamoylamino]ethyl]cyclopropanecarboxamide](http://zinc12.docking.org/img/rings/212894.gif)
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![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-(2-piperidinoethyl)urea](http://zinc12.docking.org/img/rings/212850.gif)
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![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-[2-(2-pyridyl)ethyl]urea](http://zinc12.docking.org/img/rings/212809.gif)
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![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-[2-(3-pyridyl)ethyl]urea](http://zinc12.docking.org/img/rings/212987.gif)
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![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-[3-(2-furyl)propyl]urea](http://zinc12.docking.org/img/rings/212922.gif)
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![1-[3-(cyclopropylmethoxy)propyl]-3-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)urea](http://zinc12.docking.org/img/rings/212946.gif)
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![2,4-diketo-N-phenethyl-1H-pyrido[2,3-d]pyrimidine-6-sulfonamide](http://zinc12.docking.org/img/rings/180052.gif)
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![2-(azepan-1-yl)-N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-2-keto-acetamide](http://zinc12.docking.org/img/rings/245286.gif)
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![N'-benzoyl-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-carbohydrazide](http://zinc12.docking.org/img/rings/123231.gif)
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![N'-benzoyl-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-7-carbohydrazide](http://zinc12.docking.org/img/rings/218224.gif)
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![N-(cyclopentylmethyl)-N'-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)oxamide](http://zinc12.docking.org/img/rings/341401.gif)
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![1-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)-3-phenethyl-urea](http://zinc12.docking.org/img/rings/212884.gif)
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![1-(2-cyclohexen-1-ylethyl)-3-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)urea](http://zinc12.docking.org/img/rings/212980.gif)
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![1-cyclooctyl-3-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)urea](http://zinc12.docking.org/img/rings/212978.gif)
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![2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-carboxylic Acid 2-phenoxyethyl Ester](http://zinc12.docking.org/img/rings/302839.gif)
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