![7-(piperidine-1-carbonyl)-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/485236.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)morpholine-4-carboxamide](http://zinc12.docking.org/img/rings/212970.gif)
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![N-(isoxazol-4-ylmethyl)-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/120712.gif)
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![1-cyclopentyl-3-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)urea](http://zinc12.docking.org/img/rings/212977.gif)
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![2,4-diketo-N-(2-pyridyl)-1H-pyrido[2,3-d]pyrimidine-5-carboxamide](http://zinc12.docking.org/img/rings/161582.gif)
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![2,4-diketo-N-(4-piperidyl)-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/205909.gif)
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![2,4-diketo-N-(4-pyridyl)-1H-pyrido[2,3-d]pyrimidine-7-carboxamide](http://zinc12.docking.org/img/rings/502491.gif)
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![2,4-diketo-N-(tetrahydrofuran-3-ylmethyl)-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/609706.gif)
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![5-(2-morpholinoethylamino)-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/125617.gif)
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![5-(3-imidazol-1-ylpropylamino)-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/125622.gif)
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![6-(1,4-diazepane-1-carbonyl)-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/346529.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)isonipecotamide](http://zinc12.docking.org/img/rings/495248.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)piperidine-1-carboxamide](http://zinc12.docking.org/img/rings/212838.gif)
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![N-(2-furfuryl)-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/338749.gif)
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![N-[2-(cyclopropylamino)ethyl]-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-7-carboxamide](http://zinc12.docking.org/img/rings/408291.gif)
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![2,4-diketo-1H-pyrido[2,3-d]pyrimidine-5-carboxylic Acid Phenyl Ester](http://zinc12.docking.org/img/rings/476584.gif)
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![2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-carboxylic Acid Phenyl Ester](http://zinc12.docking.org/img/rings/241799.gif)
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![2,4-diketo-1H-pyrido[2,3-d]pyrimidine-7-carboxylic Acid Phenyl Ester](http://zinc12.docking.org/img/rings/475725.gif)
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![2,4-diketo-N-phenyl-1H-pyrido[2,3-d]pyrimidine-5-carboxamide](http://zinc12.docking.org/img/rings/379462.gif)
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![2,4-diketo-N-phenyl-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/123398.gif)
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![2,4-diketo-N-phenyl-1H-pyrido[2,3-d]pyrimidine-7-carboxamide](http://zinc12.docking.org/img/rings/292493.gif)
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![7-(azepane-1-carbonyl)-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/209501.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-5-yl)benzamide](http://zinc12.docking.org/img/rings/111364.gif)
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![N-(2,4-diketo-1H-pyrido[2,3-d]pyrimidin-6-yl)benzamide](http://zinc12.docking.org/img/rings/189959.gif)
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![N-(cyclopentylmethyl)-2,4-diketo-1H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/19943.gif)
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![5-(phenethylamino)-1H-pyrido[2,3-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/125623.gif)
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