![2-(1H-1,2,4-triazol-5-ylmethyl)-3,4,6,7,8,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-9-one](http://zinc12.docking.org/img/rings/407086.gif)
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![2-benzoyl-3,4,6,7,8,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-9-one](http://zinc12.docking.org/img/rings/419042.gif)
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![8-(3-thiazol-5-ylpropanoyl)-3,4,6,7,9,9a-hexahydro-2H-pyrazino[1,2-a]pyrazin-1-one](http://zinc12.docking.org/img/rings/407545.gif)
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![8-(2-phenylacetyl)-3,4,6,7,9,9a-hexahydro-2H-pyrazino[1,2-a]pyrazin-1-one](http://zinc12.docking.org/img/rings/418291.gif)
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![8-[3-(1,3,4-thiadiazol-2-ylthio)propanoyl]-3,4,6,7,9,9a-hexahydro-2H-pyrazino[1,2-a]pyrazin-1-one](http://zinc12.docking.org/img/rings/401241.gif)
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![2-(imidazo[1,2-a]pyridine-2-carbonyl)-3,4,6,7,8,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-9-one](http://zinc12.docking.org/img/rings/416771.gif)
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![8-[3-(2,3-dihydro-1,4-benzodioxin-6-ylthio)propanoyl]-3,4,6,7,9,9a-hexahydro-2H-pyrazino[1,2-a]pyrazin-1-one](http://zinc12.docking.org/img/rings/402387.gif)
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![2-[[2-(2-thienyl)oxazol-4-yl]methyl]-3,4,6,7,8,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-9-one](http://zinc12.docking.org/img/rings/610524.gif)
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![2-[3-(tetrazol-1-yl)-3H-pyrazole-4-carbonyl]-3,4,6,7,8,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-9-one](http://zinc12.docking.org/img/rings/420662.gif)
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![2-[(2-phenyloxazol-4-yl)methyl]-3,4,6,7,8,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-9-one](http://zinc12.docking.org/img/rings/66562.gif)
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![2-[(3-cyclohexyl-1H-pyrazol-4-yl)methyl]-3,4,6,7,8,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-9-one](http://zinc12.docking.org/img/rings/598801.gif)
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![2-[(3-cyclohexyl-4H-pyrazol-4-yl)methyl]-3,4,6,7,8,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-9-one](http://zinc12.docking.org/img/rings/407323.gif)
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![2-[4-(2H-tetrazol-5-yl)benzoyl]-3,4,6,7,8,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-9-one](http://zinc12.docking.org/img/rings/416569.gif)
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![2-(1-phenylpyrazole-4-carbonyl)-3,4,6,7,8,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-9-one](http://zinc12.docking.org/img/rings/399958.gif)
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![2-(3-pyrazol-1-ylbenzoyl)-3,4,6,7,8,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-9-one](http://zinc12.docking.org/img/rings/418151.gif)
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![2-(1-cyclopentylisonipecotoyl)-3,4,6,7,8,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-9-one](http://zinc12.docking.org/img/rings/521188.gif)
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![2-[4-(pyrazol-1-ylmethyl)benzyl]-3,4,6,7,8,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-9-one](http://zinc12.docking.org/img/rings/399427.gif)
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