![2-(cyclopropanecarbonyl)-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinolin-4-one](http://zinc12.docking.org/img/rings/66455.gif)
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![2-(tetrahydrofuran-2-carbonyl)-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinolin-4-one](http://zinc12.docking.org/img/rings/66457.gif)
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![2-(1H-pyrazol-4-ylsulfonyl)-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinolin-4-one](http://zinc12.docking.org/img/rings/66552.gif)
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![2-isoxazol-4-ylsulfonyl-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinolin-4-one](http://zinc12.docking.org/img/rings/66556.gif)
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![2-(2-thienylsulfonyl)-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinolin-4-one](http://zinc12.docking.org/img/rings/52777.gif)
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![2-[2-(1,2,4-oxadiazol-3-yl)acetyl]-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinolin-4-one](http://zinc12.docking.org/img/rings/119176.gif)
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![2-(2-isoxazol-3-ylacetyl)-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinolin-4-one](http://zinc12.docking.org/img/rings/119172.gif)
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![2-(morpholine-4-carbonyl)-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinolin-4-one](http://zinc12.docking.org/img/rings/66411.gif)
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![2-cyclopentylsulfonyl-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinolin-4-one](http://zinc12.docking.org/img/rings/98644.gif)
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![2-isonicotinoyl-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinolin-4-one](http://zinc12.docking.org/img/rings/66393.gif)
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![2-isonipecotoyl-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinolin-4-one](http://zinc12.docking.org/img/rings/66417.gif)
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![2-nicotinoyl-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinolin-4-one](http://zinc12.docking.org/img/rings/66392.gif)
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![2-(2-cyclopentylacetyl)-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinolin-4-one](http://zinc12.docking.org/img/rings/529964.gif)
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![2-benzoyl-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinolin-4-one](http://zinc12.docking.org/img/rings/52723.gif)
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![N-cyclopentyl-4-keto-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinoline-2-sulfonamide](http://zinc12.docking.org/img/rings/119230.gif)
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![2-(6-keto-1H-pyridine-3-carbonyl)-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinolin-4-one](http://zinc12.docking.org/img/rings/119209.gif)
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![4-keto-N-tetrahydropyran-4-yl-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinoline-2-carboxamide](http://zinc12.docking.org/img/rings/119233.gif)
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![2-(2-tetrahydropyran-2-ylacetyl)-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinolin-4-one](http://zinc12.docking.org/img/rings/119256.gif)
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![4-keto-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinoline-2-carboxylic Acid Phenyl Ester](http://zinc12.docking.org/img/rings/66410.gif)
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![4-keto-N-phenyl-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinoline-2-carbothioamide](http://zinc12.docking.org/img/rings/97075.gif)
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![2-benzylsulfonyl-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinolin-4-one](http://zinc12.docking.org/img/rings/66435.gif)
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![4-keto-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinoline-2-carboxylic Acid Benzyl Ester](http://zinc12.docking.org/img/rings/66407.gif)
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![2-cinnamoyl-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinolin-4-one](http://zinc12.docking.org/img/rings/98645.gif)
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![2-hydrocinnamoyl-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinolin-4-one](http://zinc12.docking.org/img/rings/66423.gif)
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![N-[(4-keto-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinolin-2-yl)methylene]benzenesulfonamide](http://zinc12.docking.org/img/rings/66415.gif)
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![2-(3-phenoxypropanoyl)-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinolin-4-one](http://zinc12.docking.org/img/rings/66389.gif)
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![2-[4-(3-pyridyl)butanoyl]-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinolin-4-one](http://zinc12.docking.org/img/rings/119253.gif)
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![1-(4-keto-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinolin-2-yl)-5-phenyl-pentane-1,5-dione](http://zinc12.docking.org/img/rings/529961.gif)
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![2-(4,5,6,7-tetrahydro-1H-indazole-3-carbonyl)-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinolin-4-one](http://zinc12.docking.org/img/rings/119150.gif)
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![2-(1H-indole-3-carbonyl)-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinolin-4-one](http://zinc12.docking.org/img/rings/119188.gif)
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![2-[3-([1,2,4]triazolo[3,4-b][1,3,4]thiadiazol-6-yl)propanoyl]-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinolin-4-one](http://zinc12.docking.org/img/rings/119212.gif)
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