![2-(benzyliminomethyl)-6,7,8,9-tetrahydropyrimido[1,2-a]pyrazin-4-one](http://zinc12.docking.org/img/rings/15017.gif)
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![N-benzyl-4-keto-6,7,8,9-tetrahydropyrimido[1,2-a]pyrazine-2-carboxamide](http://zinc12.docking.org/img/rings/15043.gif)
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![2-(benzyliminomethyl)-8-(2H-triazol-4-ylmethyl)-7,9-dihydro-6H-pyrimido[1,2-a]pyrazin-4-one](http://zinc12.docking.org/img/rings/15066.gif)
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![2-(benzyliminomethyl)-8-(isoxazol-3-ylmethyl)-7,9-dihydro-6H-pyrimido[1,2-a]pyrazin-4-one](http://zinc12.docking.org/img/rings/15051.gif)
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![2-(benzyliminomethyl)-8-(oxazol-2-ylmethyl)-7,9-dihydro-6H-pyrimido[1,2-a]pyrazin-4-one](http://zinc12.docking.org/img/rings/15064.gif)
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![2-(benzyliminomethyl)-8-(oxazol-4-ylmethyl)-7,9-dihydro-6H-pyrimido[1,2-a]pyrazin-4-one](http://zinc12.docking.org/img/rings/15019.gif)
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![2-(benzyliminomethyl)-8-(thiazol-4-ylmethyl)-7,9-dihydro-6H-pyrimido[1,2-a]pyrazin-4-one](http://zinc12.docking.org/img/rings/15052.gif)
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![N-benzyl-4-keto-8-(1H-tetrazol-5-ylmethyl)-7,9-dihydro-6H-pyrimido[1,2-a]pyrazine-2-carboxamide](http://zinc12.docking.org/img/rings/15061.gif)
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![N-benzyl-4-keto-8-(1,2,4-oxadiazol-3-ylmethyl)-7,9-dihydro-6H-pyrimido[1,2-a]pyrazine-2-carboxamide](http://zinc12.docking.org/img/rings/15062.gif)
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![N-benzyl-4-keto-8-(1,3,4-oxadiazol-2-ylmethyl)-7,9-dihydro-6H-pyrimido[1,2-a]pyrazine-2-carboxamide](http://zinc12.docking.org/img/rings/15058.gif)
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![N-benzyl-4-keto-8-(1H-triazol-4-ylmethyl)-7,9-dihydro-6H-pyrimido[1,2-a]pyrazine-2-carboxamide](http://zinc12.docking.org/img/rings/15055.gif)
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![N-benzyl-4-keto-8-(1H-triazol-5-ylmethyl)-7,9-dihydro-6H-pyrimido[1,2-a]pyrazine-2-carboxamide](http://zinc12.docking.org/img/rings/15056.gif)
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![N-benzyl-4-keto-8-(1H-pyrazol-4-ylmethyl)-7,9-dihydro-6H-pyrimido[1,2-a]pyrazine-2-carboxamide](http://zinc12.docking.org/img/rings/15049.gif)
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![N-benzyl-4-keto-8-(1H-pyrazol-5-ylmethyl)-7,9-dihydro-6H-pyrimido[1,2-a]pyrazine-2-carboxamide](http://zinc12.docking.org/img/rings/15046.gif)
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![9-(benzoxymethyl)-2-(benzyliminomethyl)-6,7,8,9-tetrahydropyrimido[1,2-a]pyrazin-4-one](http://zinc12.docking.org/img/rings/15015.gif)
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![N-[[2-(benzyliminomethyl)-4-keto-6,7,8,9-tetrahydropyrazino[1,2-a]pyrimidin-9-yl]methyl]picolinamide](http://zinc12.docking.org/img/rings/15025.gif)
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![N-[[2-(benzyliminomethyl)-4-keto-6,7,8,9-tetrahydropyrazino[1,2-a]pyrimidin-9-yl]methyl]-1-keto-picolinamide](http://zinc12.docking.org/img/rings/15027.gif)
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![2-[2-(benzyliminomethyl)-4-keto-7,9-dihydro-6H-pyrazino[1,2-a]pyrimidin-8-yl]-N-(4-pyridylmethyl)acetamide](http://zinc12.docking.org/img/rings/15059.gif)
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