![1-keto-3-phenyl-2,8-diazaspiro[3.4]octane-8-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603802.gif)
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![3-keto-2-(2-keto-2-pyrrolidino-ethyl)-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603790.gif)
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![3-keto-2-(2-keto-2-piperazino-ethyl)-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603801.gif)
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![3-keto-2-(2-keto-2-piperidino-ethyl)-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603793.gif)
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![2-[2-(1,3-dioxolan-2-ylmethylamino)-2-keto-ethyl]-3-keto-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603817.gif)
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Children
![3-keto-2-[2-keto-2-(3-ketopiperazino)ethyl]-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603964.gif)
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![2-[2-(1,4-diazepan-1-yl)-2-keto-ethyl]-3-keto-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603812.gif)
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![2-[2-(2-furfurylamino)-2-keto-ethyl]-3-keto-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603605.gif)
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![3-keto-2-[2-keto-2-(2-thenylamino)ethyl]-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603558.gif)
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![3-keto-2-[2-keto-2-(3-pyridylamino)ethyl]-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603602.gif)
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![3-keto-2-[2-keto-2-(tetrahydrofurfurylamino)ethyl]-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603781.gif)
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![2-(2-anilino-2-keto-ethyl)-3-keto-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603575.gif)
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![2-[2-(azepan-1-yl)-2-keto-ethyl]-3-keto-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603798.gif)
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![2-[2-(cyclohexylamino)-2-keto-ethyl]-3-keto-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603810.gif)
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![3-keto-2-[2-keto-2-(2-pyrrol-1-ylethylamino)ethyl]-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603957.gif)
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Substances
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![3-keto-2-[2-keto-2-(4-pyridylmethylamino)ethyl]-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603568.gif)
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![3-keto-2-[2-keto-2-(N'-phenylhydrazino)ethyl]-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603595.gif)
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![3-keto-2-[2-keto-2-[2-(2-thienyl)ethylamino]ethyl]-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603611.gif)
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![2-[2-(benzylamino)-2-keto-ethyl]-3-keto-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603590.gif)
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![2-[2-(cycloheptylamino)-2-keto-ethyl]-3-keto-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603819.gif)
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![2-[2-(3-imidazol-1-ylpropylamino)-2-keto-ethyl]-3-keto-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603614.gif)
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Substances
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![3-keto-2-[2-keto-2-[(2-ketoazepan-3-yl)amino]ethyl]-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603829.gif)
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Substances
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![3-keto-2-[2-keto-2-(2-piperidinoethylamino)ethyl]-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603791.gif)
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Substances
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Children
![3-keto-2-[2-keto-2-[2-(2-pyridyl)ethylamino]ethyl]-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603598.gif)
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![2-[2-(2-cyclohexen-1-ylethylamino)-2-keto-ethyl]-3-keto-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603825.gif)
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![2-[2-(cyclooctylamino)-2-keto-ethyl]-3-keto-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603816.gif)
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![3-keto-2-[2-keto-2-(phenethylamino)ethyl]-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603556.gif)
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![3-keto-2-[2-keto-2-(3-morpholinopropylamino)ethyl]-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603826.gif)
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![3-keto-2-[2-keto-2-[3-(2-ketopyrrolidino)propylamino]ethyl]-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603789.gif)
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![2-[2-[2-(azepan-1-yl)ethylamino]-2-keto-ethyl]-3-keto-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603783.gif)
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Substances
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Children
![3-keto-2-[2-keto-2-(3-piperidinopropylamino)ethyl]-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603821.gif)
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Substances
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Children
![3-keto-2-[2-keto-2-(3-phenylpropylamino)ethyl]-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603572.gif)
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![3-keto-2-[2-keto-2-(2-norbornylamino)ethyl]-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603823.gif)
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Children
![2-(2-indolin-1-yl-2-keto-ethyl)-3-keto-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603580.gif)
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![2-[2-(1,4-dioxa-8-azaspiro[4.5]decan-8-yl)-2-keto-ethyl]-3-keto-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603814.gif)
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![2-[2-(3,4-dihydro-1H-isoquinolin-2-yl)-2-keto-ethyl]-3-keto-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603592.gif)
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![2-[2-(indan-5-ylamino)-2-keto-ethyl]-3-keto-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603561.gif)
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![3-keto-2-[2-keto-2-(piperonylamino)ethyl]-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603565.gif)
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![2-[2-(1-adamantylamino)-2-keto-ethyl]-3-keto-1-phenyl-2,5-diazaspiro[3.4]octane-5-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/603830.gif)
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