![2-phenyl-8H-pyrimido[4,5-d]pyrimidine-5,7-quinone](http://zinc12.docking.org/img/rings/225681.gif)
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![4-(1,2,4-oxadiazol-3-ylmethylthio)-8H-pyrimido[4,5-d]pyrimidine-5,7-quinone](http://zinc12.docking.org/img/rings/31392.gif)
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![4-(1,2,4-oxadiazol-5-ylmethylthio)-8H-pyrimido[4,5-d]pyrimidine-5,7-quinone](http://zinc12.docking.org/img/rings/121533.gif)
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![4-(1H-imidazol-2-ylmethylthio)-8H-pyrimido[4,5-d]pyrimidine-5,7-quinone](http://zinc12.docking.org/img/rings/133132.gif)
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![4-(oxazol-2-ylmethylthio)-8H-pyrimido[4,5-d]pyrimidine-5,7-quinone](http://zinc12.docking.org/img/rings/203692.gif)
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![4-(2-thenylthio)-8H-pyrimido[4,5-d]pyrimidine-5,7-quinone](http://zinc12.docking.org/img/rings/107945.gif)
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![4-(2-pyrazol-1-ylethylthio)-8H-pyrimido[4,5-d]pyrimidine-5,7-quinone](http://zinc12.docking.org/img/rings/203520.gif)
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![4-(2-pyridylmethylthio)-8H-pyrimido[4,5-d]pyrimidine-5,7-quinone](http://zinc12.docking.org/img/rings/99848.gif)
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![4-(benzylthio)-8H-pyrimido[4,5-d]pyrimidine-5,7-quinone](http://zinc12.docking.org/img/rings/107937.gif)
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![4-(cyclohexylmethylthio)-8H-pyrimido[4,5-d]pyrimidine-5,7-quinone](http://zinc12.docking.org/img/rings/382224.gif)
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![5-[(2-ketoazepan-3-yl)thio]-1H-pyrimido[4,5-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/45254.gif)
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![5-[[2-keto-2-(1H-pyrrol-2-yl)ethyl]thio]-1H-pyrimido[4,5-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/107976.gif)
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![5-[[2-keto-2-(2-thienyl)ethyl]thio]-1H-pyrimido[4,5-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/112344.gif)
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![2-[(2,4-diketo-1H-pyrimido[4,5-d]pyrimidin-5-yl)thio]-N-isoxazol-3-yl-acetamide](http://zinc12.docking.org/img/rings/367138.gif)
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![2-[(2,4-diketo-1H-pyrimido[4,5-d]pyrimidin-5-yl)thio]-N-isoxazol-5-yl-acetamide](http://zinc12.docking.org/img/rings/45250.gif)
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![2-[(2,4-diketo-1H-pyrimido[4,5-d]pyrimidin-5-yl)thio]-N-thiazol-2-yl-acetamide](http://zinc12.docking.org/img/rings/45251.gif)
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![2-[(2,4-diketo-1H-pyrimido[4,5-d]pyrimidin-5-yl)thio]-N-(2-thienyl)acetamide](http://zinc12.docking.org/img/rings/107947.gif)
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![5-[(2-keto-2-piperazino-ethyl)thio]-1H-pyrimido[4,5-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/107950.gif)
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![N-cyclopentyl-2-[(2,4-diketo-1H-pyrimido[4,5-d]pyrimidin-5-yl)thio]acetamide](http://zinc12.docking.org/img/rings/114060.gif)
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![5-(phenacylthio)-1H-pyrimido[4,5-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/6842.gif)
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![3-[(2,4-diketo-1H-pyrimido[4,5-d]pyrimidin-5-yl)thio]-N-isoxazol-3-yl-propionamide](http://zinc12.docking.org/img/rings/45259.gif)
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![2-[(2,4-diketo-1H-pyrimido[4,5-d]pyrimidin-5-yl)thio]-N-(2-pyridyl)acetamide](http://zinc12.docking.org/img/rings/45235.gif)
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![2-[(2,4-diketo-1H-pyrimido[4,5-d]pyrimidin-5-yl)thio]-N-(4-piperidyl)acetamide](http://zinc12.docking.org/img/rings/44414.gif)
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![2-[(2,4-diketo-1H-pyrimido[4,5-d]pyrimidin-5-yl)thio]-N-phenyl-acetamide](http://zinc12.docking.org/img/rings/45241.gif)
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![N-cyclohexyl-2-[(2,4-diketo-1H-pyrimido[4,5-d]pyrimidin-5-yl)thio]acetamide](http://zinc12.docking.org/img/rings/44411.gif)
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![N-(2,5-diketoimidazolidin-1-yl)-2-[(2,4-diketo-1H-pyrimido[4,5-d]pyrimidin-5-yl)thio]acetamide](http://zinc12.docking.org/img/rings/44416.gif)
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![N-(cyclohexylmethyl)-2-[(2,4-diketo-1H-pyrimido[4,5-d]pyrimidin-5-yl)thio]acetamide](http://zinc12.docking.org/img/rings/369647.gif)
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![N-benzyl-2-[(2,4-diketo-1H-pyrimido[4,5-d]pyrimidin-5-yl)thio]acetamide](http://zinc12.docking.org/img/rings/44405.gif)
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![N-cycloheptyl-2-[(2,4-diketo-1H-pyrimido[4,5-d]pyrimidin-5-yl)thio]acetamide](http://zinc12.docking.org/img/rings/369649.gif)
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![4-[(4-keto-3H-quinazolin-2-yl)methylthio]-8H-pyrimido[4,5-d]pyrimidine-5,7-quinone](http://zinc12.docking.org/img/rings/45243.gif)
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![5-[(2-indolin-1-yl-2-keto-ethyl)thio]-1H-pyrimido[4,5-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/107958.gif)
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![5-[(2-ketochromen-4-yl)methylthio]-1H-pyrimido[4,5-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/107965.gif)
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![2-[(2,4-diketo-1H-pyrimido[4,5-d]pyrimidin-5-yl)thio]-N-piazthiol-4-yl-acetamide](http://zinc12.docking.org/img/rings/107978.gif)
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![N-(1,3-benzothiazol-2-yl)-2-[(2,4-diketo-1H-pyrimido[4,5-d]pyrimidin-5-yl)thio]acetamide](http://zinc12.docking.org/img/rings/45246.gif)
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![5-[[2-(3,4-dihydro-2H-quinolin-1-yl)-2-keto-ethyl]thio]-1H-pyrimido[4,5-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/107972.gif)
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![2-[(2,4-diketo-1H-pyrimido[4,5-d]pyrimidin-5-yl)thio]-N-(2-keto-1,3-dihydrobenzimidazol-5-yl)acetamide](http://zinc12.docking.org/img/rings/500344.gif)
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![N-(2,3-dihydro-1,4-benzodioxin-6-yl)-2-[(2,4-diketo-1H-pyrimido[4,5-d]pyrimidin-5-yl)thio]acetamide](http://zinc12.docking.org/img/rings/107951.gif)
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![N-[2-(2,3-dihydro-1,4-benzodioxin-6-yl)ethyl]-2-[(2,4-diketo-1H-pyrimido[4,5-d]pyrimidin-5-yl)thio]acetamide](http://zinc12.docking.org/img/rings/45242.gif)
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![2,8-dicyclopropylpyrimido[4,5-d]pyrimidine-5,7-quinone](http://zinc12.docking.org/img/rings/137701.gif)
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![4-[(5-phenyl-1,2,4-oxadiazol-3-yl)methylthio]-8H-pyrimido[4,5-d]pyrimidine-5,7-quinone](http://zinc12.docking.org/img/rings/144458.gif)
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![4-[(2-phenylpyrazol-3-yl)methylthio]-8H-pyrimido[4,5-d]pyrimidine-5,7-quinone](http://zinc12.docking.org/img/rings/44412.gif)
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![4-[(2-phenylthiazol-4-yl)methylthio]-8H-pyrimido[4,5-d]pyrimidine-5,7-quinone](http://zinc12.docking.org/img/rings/107940.gif)
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![2-[(2,4-diketo-1H-pyrimido[4,5-d]pyrimidin-5-yl)thio]-N-(2-phenylpyrazol-3-yl)acetamide](http://zinc12.docking.org/img/rings/114058.gif)
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![2-[(2,4-diketo-7-phenyl-1H-pyrimido[4,5-d]pyrimidin-5-yl)thio]-N-isoxazol-3-yl-acetamide](http://zinc12.docking.org/img/rings/590295.gif)
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![5-[[2-(4-benzylpiperazino)-2-keto-ethyl]thio]-1H-pyrimido[4,5-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/95118.gif)
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![4-(cyclohexylmethylthio)-2,8-dicyclopropyl-pyrimido[4,5-d]pyrimidine-5,7-quinone](http://zinc12.docking.org/img/rings/382999.gif)
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![1,7-dicyclopropyl-5-[[2-keto-2-(3H-pyrrol-4-yl)ethyl]thio]pyrimido[4,5-d]pyrimidine-2,4-quinone](http://zinc12.docking.org/img/rings/600213.gif)
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![2-[(1,7-dicyclopropyl-2,4-diketo-pyrimido[4,5-d]pyrimidin-5-yl)thio]-N-(2-furfuryl)acetamide](http://zinc12.docking.org/img/rings/237626.gif)
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![2,8-dicyclopropyl-4-[3-(2-furfuryloxy)propylthio]pyrimido[4,5-d]pyrimidine-5,7-quinone](http://zinc12.docking.org/img/rings/190962.gif)
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![4-(3-benzoxypropylthio)-2,8-dicyclopropyl-pyrimido[4,5-d]pyrimidine-5,7-quinone](http://zinc12.docking.org/img/rings/190966.gif)
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