![N-cyclopropyl-4-keto-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/180344.gif)
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![3-benzylpyrido[2,3-d]pyrimidin-4-one](http://zinc12.docking.org/img/rings/180265.gif)
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![4-keto-N-(1H-pyrazol-5-yl)-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/318734.gif)
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![4-keto-N-thiazol-2-yl-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/593492.gif)
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![6-(piperidine-1-carbonyl)-3H-pyrido[2,3-d]pyrimidin-4-one](http://zinc12.docking.org/img/rings/66009.gif)
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![N-(cyclobutylmethyl)-4-keto-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/548150.gif)
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![6-(benzylamino)-3H-pyrido[2,3-d]pyrimidin-4-one](http://zinc12.docking.org/img/rings/469353.gif)
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![3-phenethylpyrido[2,3-d]pyrimidin-4-one](http://zinc12.docking.org/img/rings/202465.gif)
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![4-keto-N-(1H-pyrazol-4-ylmethyl)-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/260971.gif)
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![4-keto-N-(1H-pyrazol-5-ylmethyl)-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/252398.gif)
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![4-keto-N-(thiazol-2-ylmethyl)-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/596017.gif)
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![4-keto-N-(thiazol-5-ylmethyl)-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/286960.gif)
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![N-(isoxazol-3-ylmethyl)-4-keto-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/84389.gif)
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![N-(isoxazol-4-ylmethyl)-4-keto-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/121273.gif)
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![4-keto-N-(2-thenyl)-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/43873.gif)
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![4-keto-N-(3-pyridyl)-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/70742.gif)
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![4-keto-N-(pyrrolidin-2-ylmethyl)-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/361386.gif)
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![4-keto-N-(tetrahydrofurfuryl)-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/232461.gif)
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![6-(1,4-diazepane-1-carbonyl)-3H-pyrido[2,3-d]pyrimidin-4-one](http://zinc12.docking.org/img/rings/346257.gif)
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![N-(2-furfuryl)-4-keto-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/338725.gif)
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![N-(3-furfuryl)-4-keto-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/514559.gif)
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![N-[2-(cyclopropylamino)ethyl]-4-keto-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/324118.gif)
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![4-keto-3H-pyrido[2,3-d]pyrimidine-6-carboxylic Acid Phenyl Ester](http://zinc12.docking.org/img/rings/91406.gif)
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![4-keto-N-phenyl-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/39148.gif)
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![6-(azepane-1-carbonyl)-3H-pyrido[2,3-d]pyrimidin-4-one](http://zinc12.docking.org/img/rings/181421.gif)
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![N-(cyclopentylmethyl)-4-keto-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/296123.gif)
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![N-cyclohexyl-4-keto-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/63603.gif)
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![4-keto-N-[(5-thioxo-1,4-dihydro-1,2,4-triazol-3-yl)methyl]-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/310851.gif)
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![4-keto-N-(3-piperidylmethyl)-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/345254.gif)
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![4-keto-N-(4-piperidylmethyl)-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/505231.gif)
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![4-keto-N-(4-pyridylmethyl)-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/620017.gif)
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![4-keto-N-[2-(3-thienyl)ethyl]-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/30046.gif)
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![N-(cyclohexylmethyl)-4-keto-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/418883.gif)
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![N-benzyl-4-keto-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/32822.gif)
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![3-(3-phenoxypropyl)pyrido[2,3-d]pyrimidin-4-one](http://zinc12.docking.org/img/rings/190948.gif)
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![N'-(3-furoyl)-4-keto-3H-pyrido[2,3-d]pyrimidine-6-carbohydrazide](http://zinc12.docking.org/img/rings/219720.gif)
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![4-keto-N-(3-pyrazol-1-ylpropyl)-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/257500.gif)
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![4-keto-N-(2-piperidinoethyl)-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/70559.gif)
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![4-keto-N-[2-(2-pyridyl)ethyl]-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/216062.gif)
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![3-(4-ketopyrido[2,3-d]pyrimidin-3-yl)-N-phenyl-propionamide](http://zinc12.docking.org/img/rings/298117.gif)
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![4-keto-N-phenethyl-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/296452.gif)
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![N-(2-cyclohexylethyl)-4-keto-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/355699.gif)
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![4-keto-N-[2-(pyrazin-2-ylamino)ethyl]-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/260989.gif)
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![N'-benzoyl-4-keto-3H-pyrido[2,3-d]pyrimidine-6-carbohydrazide](http://zinc12.docking.org/img/rings/218145.gif)
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![N-(4-imidazol-1-ylbutyl)-4-keto-3H-pyrido[2,3-d]pyrimidine-6-carboxamide](http://zinc12.docking.org/img/rings/411637.gif)
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