![3-[3-(1,3-benzoxazol-2-yl)-2-keto-propyl]-1,3-diazaspiro[4.4]nonane-2,4-quinone](http://zinc12.docking.org/img/rings/547043.gif)
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![2-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)-N-indan-1-yl-acetamide](http://zinc12.docking.org/img/rings/620918.gif)
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![3-[2-(3,4,4a,5,6,7,8,8a-octahydro-2H-quinolin-1-yl)-2-keto-ethyl]-1,3-diazaspiro[4.4]nonane-2,4-quinone](http://zinc12.docking.org/img/rings/553081.gif)
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![3-[2-(3,4-dihydro-2H-quinolin-1-yl)-2-keto-ethyl]-1,3-diazaspiro[4.4]nonane-2,4-quinone](http://zinc12.docking.org/img/rings/464153.gif)
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![2-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)-N-(7-keto-5,6-dihydro-4H-1,3-benzothiazol-2-yl)acetamide](http://zinc12.docking.org/img/rings/615850.gif)
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![2-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)-N-piperonyl-acetamide](http://zinc12.docking.org/img/rings/364042.gif)
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![2-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)acetic Acid Piperonyl Ester](http://zinc12.docking.org/img/rings/145523.gif)
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![3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)-N-(1H-indazol-7-yl)propionamide](http://zinc12.docking.org/img/rings/344756.gif)
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![3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)-N-(4,5,6,7-tetrahydro-1,3-benzothiazol-2-yl)propionamide](http://zinc12.docking.org/img/rings/442391.gif)
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![3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)-N-(5,6,7,8-tetrahydroimidazo[1,2-a]pyridin-6-yl)propionamide](http://zinc12.docking.org/img/rings/426699.gif)
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![N-(1,3-benzothiazol-2-yl)-3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)propionamide](http://zinc12.docking.org/img/rings/137286.gif)
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![N-(1,3-benzothiazol-2-ylmethyl)-2-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)acetamide](http://zinc12.docking.org/img/rings/331592.gif)
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![N-(1,3-benzothiazol-6-yl)-3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)propionamide](http://zinc12.docking.org/img/rings/51054.gif)
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![N-(1,3-dihydrobenzimidazol-2-ylidene)-3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)propionamide](http://zinc12.docking.org/img/rings/441622.gif)
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![2-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)-N-(1H-indol-7-ylmethyl)acetamide](http://zinc12.docking.org/img/rings/445301.gif)
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![2-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)acetic Acid 6-quinolyl Ester](http://zinc12.docking.org/img/rings/485848.gif)
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![3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)-N-(1H-indol-5-yl)propionamide](http://zinc12.docking.org/img/rings/388191.gif)
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![3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)propionic Acid Coumaran-7-yl Ester](http://zinc12.docking.org/img/rings/476155.gif)
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![3-[2-keto-2-(1,2,3,5-tetrahydro-1,4-benzodiazepin-4-yl)ethyl]-1,3-diazaspiro[4.4]nonane-2,4-quinone](http://zinc12.docking.org/img/rings/160793.gif)
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![3-[3-(1H-benzimidazol-2-ylmethylamino)propyl]-1,3-diazaspiro[4.4]nonane-2,4-quinone](http://zinc12.docking.org/img/rings/436720.gif)
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![3-[3-(quinazolin-4-ylamino)propyl]-1,3-diazaspiro[4.4]nonane-2,4-quinone](http://zinc12.docking.org/img/rings/299724.gif)
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![3-[3-(quinoxalin-2-ylamino)propyl]-1,3-diazaspiro[4.4]nonane-2,4-quinone](http://zinc12.docking.org/img/rings/586817.gif)
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![N-(benzofuran-2-ylmethyl)-2-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)acetamide](http://zinc12.docking.org/img/rings/52878.gif)
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![2-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)-N-(1-naphthyl)acetamide](http://zinc12.docking.org/img/rings/359221.gif)
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![2-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)-N-(indan-5-ylmethyl)acetamide](http://zinc12.docking.org/img/rings/200919.gif)
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![2-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)acetic Acid 2-naphthyl Ester](http://zinc12.docking.org/img/rings/542746.gif)
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![3-(4-indolin-1-yl-4-keto-butyl)-1,3-diazaspiro[4.4]nonane-2,4-quinone](http://zinc12.docking.org/img/rings/445422.gif)
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![3-[3-(3,4,4a,5,6,7,8,8a-octahydro-2H-quinolin-1-yl)-3-keto-propyl]-1,3-diazaspiro[4.4]nonane-2,4-quinone](http://zinc12.docking.org/img/rings/553180.gif)
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![3-[3-(3,4-dihydro-2H-quinolin-1-yl)-3-keto-propyl]-1,3-diazaspiro[4.4]nonane-2,4-quinone](http://zinc12.docking.org/img/rings/241287.gif)
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![3-[3-(6-quinolylamino)propyl]-1,3-diazaspiro[4.4]nonane-2,4-quinone](http://zinc12.docking.org/img/rings/613091.gif)
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![3-[3-(benzofuran-2-ylmethylamino)propyl]-1,3-diazaspiro[4.4]nonane-2,4-quinone](http://zinc12.docking.org/img/rings/467189.gif)
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![3-(3-tetralin-1-yloxypropyl)-1,3-diazaspiro[4.4]nonane-2,4-quinone](http://zinc12.docking.org/img/rings/242084.gif)
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![3-[3-(2-naphthoxy)propyl]-1,3-diazaspiro[4.4]nonane-2,4-quinone](http://zinc12.docking.org/img/rings/582182.gif)
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![8-[3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)propylamino]-7H-xanthine](http://zinc12.docking.org/img/rings/79367.gif)
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![3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)-N-(7-keto-5,6-dihydro-4H-1,3-benzothiazol-2-yl)propionamide](http://zinc12.docking.org/img/rings/616357.gif)
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![N'-(1,3-benzothiazol-2-yl)-3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)propionohydrazide](http://zinc12.docking.org/img/rings/434311.gif)
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![N-(6,7-dihydro-5H-pyrrolo[2,1-c][1,2,4]triazol-3-ylmethyl)-4-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)butyramide](http://zinc12.docking.org/img/rings/434600.gif)
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![2-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)acetic Acid (4-ketochroman-7-yl) Ester](http://zinc12.docking.org/img/rings/486358.gif)
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![2-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)acetic Acid 2,3-dihydro-1,4-benzodioxin-5-ylmethyl Ester](http://zinc12.docking.org/img/rings/335814.gif)
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![2-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)acetic Acid 2,3-dihydro-1,4-benzodioxin-6-ylmethyl Ester](http://zinc12.docking.org/img/rings/383395.gif)
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![3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)-N-piperonyl-propionamide](http://zinc12.docking.org/img/rings/455605.gif)
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![3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)propionic Acid 1H-benzimidazol-2-ylmethyl Ester](http://zinc12.docking.org/img/rings/448784.gif)
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![3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)propionic Acid Piperonyl Ester](http://zinc12.docking.org/img/rings/380993.gif)
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![4-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)-N-(1H-indazol-7-yl)butyramide](http://zinc12.docking.org/img/rings/344734.gif)
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![N-(1,3-benzoxazol-5-yl)-4-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)butyramide](http://zinc12.docking.org/img/rings/231156.gif)
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![N-(2,3-dihydro-1,4-benzodioxin-5-ylmethyl)-2-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)acetamide](http://zinc12.docking.org/img/rings/351720.gif)
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![N-[2-(1H-benzimidazol-2-yl)ethyl]-2-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)acetamide](http://zinc12.docking.org/img/rings/27204.gif)
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![N-[3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)propyl]-1H-indazole-4-carboxamide](http://zinc12.docking.org/img/rings/608248.gif)
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![N-[3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)propyl]imidazo[1,2-a]pyridine-2-carboxamide](http://zinc12.docking.org/img/rings/589836.gif)
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![3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)propionic Acid 6-quinolyl Ester](http://zinc12.docking.org/img/rings/485684.gif)
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