![1-[3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)propyl]-3-[(2-keto-1H-pyridin-3-yl)methyl]urea](http://zinc12.docking.org/img/rings/209670.gif)
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![2-[[2-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)acetyl]amino]-N-(3-pyridylmethyl)acetamide](http://zinc12.docking.org/img/rings/580312.gif)
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![4-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)-N-(2-keto-2-morpholino-ethyl)butyramide](http://zinc12.docking.org/img/rings/299001.gif)
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![N'-[2-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)acetyl]-2-phenoxy-acetohydrazide](http://zinc12.docking.org/img/rings/573640.gif)
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![1-benzoxy-3-[3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)propyl]urea](http://zinc12.docking.org/img/rings/209686.gif)
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![2-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)-N-[4-(2-keto-1-pyridyl)butyl]acetamide](http://zinc12.docking.org/img/rings/572958.gif)
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![N'-[4-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)butanoyl]benzohydrazide](http://zinc12.docking.org/img/rings/218630.gif)
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![N-(2-anilino-2-keto-ethyl)-3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)propionamide](http://zinc12.docking.org/img/rings/441876.gif)
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![N-[3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)propyl]-N'-phenyl-oxamide](http://zinc12.docking.org/img/rings/415470.gif)
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![1-(2-cyclohexylethyl)-3-[3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)propyl]urea](http://zinc12.docking.org/img/rings/331559.gif)
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![1-[3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)propyl]-3-phenethyl-guanidine](http://zinc12.docking.org/img/rings/282573.gif)
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![1-[3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)propyl]-3-phenethyl-urea](http://zinc12.docking.org/img/rings/270185.gif)
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![3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)-N-(3-phenoxypropyl)propionamide](http://zinc12.docking.org/img/rings/286252.gif)
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![3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)-N-(4-piperidinobutyl)propionamide](http://zinc12.docking.org/img/rings/206478.gif)
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![3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)propionic Acid 3-phenoxypropyl Ester](http://zinc12.docking.org/img/rings/375490.gif)
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![3-anilino-N-[3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)propyl]propionamide](http://zinc12.docking.org/img/rings/599880.gif)
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![4-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)-N-(2-phenoxyethyl)butyramide](http://zinc12.docking.org/img/rings/476727.gif)
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![4-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)butyric Acid 2-phenoxyethyl Ester](http://zinc12.docking.org/img/rings/390781.gif)
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![N-(3-benzoxypropyl)-2-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)acetamide](http://zinc12.docking.org/img/rings/292202.gif)
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![N-[2-(cyclohexylamino)ethyl]-4-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)butyramide](http://zinc12.docking.org/img/rings/250632.gif)
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![N-[3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)propyl]-3-phenoxy-propionamide](http://zinc12.docking.org/img/rings/151773.gif)
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![N-[3-(cyclohexylamino)propyl]-3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)propionamide](http://zinc12.docking.org/img/rings/358945.gif)
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![4-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)-N-(3-phenylpropyl)butyramide](http://zinc12.docking.org/img/rings/293422.gif)
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![1-benzamido-3-[3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)propyl]urea](http://zinc12.docking.org/img/rings/457516.gif)
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![N'-[2-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)acetyl]-3-phenoxy-propionohydrazide](http://zinc12.docking.org/img/rings/219355.gif)
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![3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)-N-[4-(2-keto-1-pyridyl)butyl]propionamide](http://zinc12.docking.org/img/rings/574315.gif)
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![N-[2-(benzylamino)-2-keto-ethyl]-3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)propionamide](http://zinc12.docking.org/img/rings/441926.gif)
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![N-[2-(benzylamino)ethyl]-4-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)butyramide](http://zinc12.docking.org/img/rings/49339.gif)
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![N-[3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)propyl]-2-(phenethylthio)acetamide](http://zinc12.docking.org/img/rings/579687.gif)
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![N-[3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)propyl]-6-(2-thienyl)hexanamide](http://zinc12.docking.org/img/rings/492257.gif)
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![N-[3-(cyclohexylamino)propyl]-4-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)butyramide](http://zinc12.docking.org/img/rings/358984.gif)
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![1-[(2-cyclohexylacetyl)amino]-3-[3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)propyl]urea](http://zinc12.docking.org/img/rings/457511.gif)
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![N'-[3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)propanoyl]-3-phenoxy-propionohydrazide](http://zinc12.docking.org/img/rings/219262.gif)
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![N-(2-besylethyl)-4-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)butyramide](http://zinc12.docking.org/img/rings/80858.gif)
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![N-cyclohexyl-2-[3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)propylcarbamoylamino]acetamide](http://zinc12.docking.org/img/rings/191032.gif)
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![N-cyclopentyl-3-[3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)propylcarbamoylamino]propionamide](http://zinc12.docking.org/img/rings/151942.gif)
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![2-[4-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)butanoylamino]acetic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/118068.gif)
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![4-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)-N-[4-(2-keto-1-pyridyl)butyl]butyramide](http://zinc12.docking.org/img/rings/573487.gif)
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![2-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)acetic Acid [2-[(2-anilino-2-keto-ethyl)amino]-2-keto-ethyl] Ester](http://zinc12.docking.org/img/rings/255429.gif)
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![3-(8-quinolylmethyl)-1,3-diazaspiro[4.4]nonane-2,4-quinone](http://zinc12.docking.org/img/rings/570767.gif)
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![3-[(4-ketopyrido[1,2-a]pyrimidin-2-yl)methyl]-1,3-diazaspiro[4.4]nonane-2,4-quinone](http://zinc12.docking.org/img/rings/8280.gif)
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![3-[2-(3,4a,5,6,7,7a-hexahydro-2H-cyclopenta[b][1,4]oxazin-4-yl)-2-keto-ethyl]-1,3-diazaspiro[4.4]nonane-2,4-quinone](http://zinc12.docking.org/img/rings/54745.gif)
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![3-[2-(6,7-dihydro-4H-thieno[3,2-c]pyridin-5-yl)-2-keto-ethyl]-1,3-diazaspiro[4.4]nonane-2,4-quinone](http://zinc12.docking.org/img/rings/258530.gif)
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![3-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)-N-(2-norbornyl)propionamide](http://zinc12.docking.org/img/rings/441002.gif)
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![3-(2-indolin-1-yl-2-keto-ethyl)-1,3-diazaspiro[4.4]nonane-2,4-quinone](http://zinc12.docking.org/img/rings/335968.gif)
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![2-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)-N-(1H-indazol-7-yl)acetamide](http://zinc12.docking.org/img/rings/344892.gif)
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![N-(1,3-dihydrobenzimidazol-2-ylidene)-2-(2,4-diketo-1,3-diazaspiro[4.4]nonan-3-yl)acetamide](http://zinc12.docking.org/img/rings/180381.gif)
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![3-[2-(1,3,4,5,7,8,9,9a-octahydropyrrolo[1,2-a][1,4]diazepin-2-yl)-2-keto-ethyl]-1,3-diazaspiro[4.4]nonane-2,4-quinone](http://zinc12.docking.org/img/rings/351036.gif)
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![3-[3-(1,3-benzothiazol-2-yl)-2-keto-propyl]-1,3-diazaspiro[4.4]nonane-2,4-quinone](http://zinc12.docking.org/img/rings/536772.gif)
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![3-[3-(1,3-benzothiazol-2-ylamino)propyl]-1,3-diazaspiro[4.4]nonane-2,4-quinone](http://zinc12.docking.org/img/rings/299721.gif)
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