![4-(2-piperazinoacetyl)spiro[1H-quinoxaline-3,1'-cyclopentane]-2-one](http://zinc12.docking.org/img/rings/173693.gif)
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![4-(2-piperidinoacetyl)spiro[1H-quinoxaline-3,1'-cyclopentane]-2-one](http://zinc12.docking.org/img/rings/112742.gif)
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![4-[2-(3-ketopiperazino)acetyl]spiro[1H-quinoxaline-3,1'-cyclopentane]-2-one](http://zinc12.docking.org/img/rings/179974.gif)
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![4-[2-(isoxazol-4-ylmethylamino)acetyl]spiro[1H-quinoxaline-3,1'-cyclopentane]-2-one](http://zinc12.docking.org/img/rings/614577.gif)
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![4-[2-(1,4-diazepan-1-yl)acetyl]spiro[1H-quinoxaline-3,1'-cyclopentane]-2-one](http://zinc12.docking.org/img/rings/270927.gif)
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![4-[2-(2-furfurylamino)acetyl]spiro[1H-quinoxaline-3,1'-cyclopentane]-2-one](http://zinc12.docking.org/img/rings/267927.gif)
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![4-(2-phenoxyacetyl)spiro[1H-quinoxaline-3,1'-cyclopentane]-2-one](http://zinc12.docking.org/img/rings/100147.gif)
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![Benzoic Acid [2-keto-2-(3-ketospiro[4H-quinoxaline-2,1'-cyclopentane]-1-yl)ethyl] Ester](http://zinc12.docking.org/img/rings/10530.gif)
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![3-(1H-pyrazol-4-yl)acrylic Acid [2-keto-2-(3-ketospiro[4H-quinoxaline-2,1'-cyclopentane]-1-yl)ethyl] Ester](http://zinc12.docking.org/img/rings/187606.gif)
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![2-phenoxyacetic Acid [2-keto-2-(3-ketospiro[4H-quinoxaline-2,1'-cyclopentane]-1-yl)ethyl] Ester](http://zinc12.docking.org/img/rings/99727.gif)
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![3-phenylacrylic Acid [2-keto-2-(3-ketospiro[4H-quinoxaline-2,1'-cyclopentane]-1-yl)ethyl] Ester](http://zinc12.docking.org/img/rings/10781.gif)
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![1H-indazole-6-carboxylic Acid [2-keto-2-(3-ketospiro[4H-quinoxaline-2,1'-cyclopentane]-1-yl)ethyl] Ester](http://zinc12.docking.org/img/rings/193082.gif)
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![4-[2-[4-(2-pyridyl)piperazino]acetyl]spiro[1H-quinoxaline-3,1'-cyclopentane]-2-one](http://zinc12.docking.org/img/rings/95124.gif)
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![4-[2-[4-(2-thenyl)piperazino]acetyl]spiro[1H-quinoxaline-3,1'-cyclopentane]-2-one](http://zinc12.docking.org/img/rings/504112.gif)
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![4-[2-(2-phenylmorpholino)acetyl]spiro[1H-quinoxaline-3,1'-cyclopentane]-2-one](http://zinc12.docking.org/img/rings/499017.gif)
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![1-phenylpyrazole-4-carboxylic Acid [2-keto-2-(3-ketospiro[4H-quinoxaline-2,1'-cyclopentane]-1-yl)ethyl] Ester](http://zinc12.docking.org/img/rings/99863.gif)
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