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    —— (9aR)-2-(4-pyrazol-1-ylbenzoyl)-3,4,6,7,8,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-9-one —— C17H19N5O2
    (9aR)-2-(4-pyrazol-1-ylbenzoyl)-3,4,6,7,8,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-9-one
    —— (9aS)-2-[(4-chloro-1-methylindazol-3-yl)methyl]-8-methyl-3,4,7,9a-tetrahydro-1H-pyrazino[1,2-a]pyrazine-6,9-dione —— C17H20ClN5O2
    (9aS)-2-[(4-chloro-1-methylindazol-3-yl)methyl]-8-methyl-3,4,7,9a-tetrahydro-1H-pyrazino[1,2-a]pyrazine-6,9-dione
    —— (9aR)-2-[(4-chloro-1-methylindazol-3-yl)methyl]-8-methyl-3,4,7,9a-tetrahydro-1H-pyrazino[1,2-a]pyrazine-6,9-dione —— C17H20ClN5O2
    (9aR)-2-[(4-chloro-1-methylindazol-3-yl)methyl]-8-methyl-3,4,7,9a-tetrahydro-1H-pyrazino[1,2-a]pyrazine-6,9-dione
    —— (9aR)-2-[3-(2,4-difluorophenyl)propanoyl]-8-methyl-1,3,4,6,7,9a-hexahydropyrazino[1,2-a]pyrazin-9-one —— C17H21F2N3O2
    (9aR)-2-[3-(2,4-difluorophenyl)propanoyl]-8-methyl-1,3,4,6,7,9a-hexahydropyrazino[1,2-a]pyrazin-9-one
    —— (9aS)-2-(2-methoxy-4-methyl-1,3-thiazole-5-carbonyl)-8-methyl-1,3,4,6,7,9a-hexahydropyrazino[1,2-a]pyrazin-9-one —— C14H20N4O3S
    (9aS)-2-(2-methoxy-4-methyl-1,3-thiazole-5-carbonyl)-8-methyl-1,3,4,6,7,9a-hexahydropyrazino[1,2-a]pyrazin-9-one
    —— (9aR)-8-methyl-2-[(E)-2-phenylethenyl]sulfonyl-3,4,7,9a-tetrahydro-1H-pyrazino[1,2-a]pyrazine-6,9-dione —— C16H19N3O4S
    (9aR)-8-methyl-2-[(E)-2-phenylethenyl]sulfonyl-3,4,7,9a-tetrahydro-1H-pyrazino[1,2-a]pyrazine-6,9-dione
    —— (9aS)-8-methyl-2-[(E)-2-phenylethenyl]sulfonyl-3,4,7,9a-tetrahydro-1H-pyrazino[1,2-a]pyrazine-6,9-dione —— C16H19N3O4S
    (9aS)-8-methyl-2-[(E)-2-phenylethenyl]sulfonyl-3,4,7,9a-tetrahydro-1H-pyrazino[1,2-a]pyrazine-6,9-dione
    —— (9aS)-2-[(4-imidazol-1-ylphenyl)methyl]-8-methyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazine —— C18H25N5
    (9aS)-2-[(4-imidazol-1-ylphenyl)methyl]-8-methyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazine
    —— (9R)-1-ethyl-9-(2-propan-2-ylpyrimidin-4-yl)-8,9-dihydro-6H-pyrido[3,2-g][1,4]benzoxazine-2,7-dione —— C20H22N4O3
    (9R)-1-ethyl-9-(2-propan-2-ylpyrimidin-4-yl)-8,9-dihydro-6H-pyrido[3,2-g][1,4]benzoxazine-2,7-dione
    —— (9S)-1-ethyl-9-(2-propan-2-ylpyrimidin-4-yl)-8,9-dihydro-6H-pyrido[3,2-g][1,4]benzoxazine-2,7-dione —— C20H22N4O3
    (9S)-1-ethyl-9-(2-propan-2-ylpyrimidin-4-yl)-8,9-dihydro-6H-pyrido[3,2-g][1,4]benzoxazine-2,7-dione
    —— (9aR)-2-[[2-[2-(dimethylamino)ethoxy]phenyl]methyl]-1,3,4,7,8,9a-hexahydropyrazino[1,2-a]pyrazine-6,9-dione —— C18H26N4O3
    (9aR)-2-[[2-[2-(dimethylamino)ethoxy]phenyl]methyl]-1,3,4,7,8,9a-hexahydropyrazino[1,2-a]pyrazine-6,9-dione
    —— (9aS)-8-methyl-2-[2-(4-propanoylphenoxy)acetyl]-1,3,4,6,7,9a-hexahydropyrazino[1,2-a]pyrazin-9-one —— C19H25N3O4
    (9aS)-8-methyl-2-[2-(4-propanoylphenoxy)acetyl]-1,3,4,6,7,9a-hexahydropyrazino[1,2-a]pyrazin-9-one
    —— (9aR)-2-(2-methoxy-4-methyl-1,3-thiazole-5-carbonyl)-8-methyl-1,3,4,6,7,9a-hexahydropyrazino[1,2-a]pyrazin-9-one —— C14H20N4O3S
    (9aR)-2-(2-methoxy-4-methyl-1,3-thiazole-5-carbonyl)-8-methyl-1,3,4,6,7,9a-hexahydropyrazino[1,2-a]pyrazin-9-one
    —— (9aS)-2-[[2-[2-(dimethylamino)ethoxy]phenyl]methyl]-1,3,4,7,8,9a-hexahydropyrazino[1,2-a]pyrazine-6,9-dione —— C18H26N4O3
    (9aS)-2-[[2-[2-(dimethylamino)ethoxy]phenyl]methyl]-1,3,4,7,8,9a-hexahydropyrazino[1,2-a]pyrazine-6,9-dione
    —— (9aR)-8-methyl-2-[2-(4-propanoylphenoxy)acetyl]-1,3,4,6,7,9a-hexahydropyrazino[1,2-a]pyrazin-9-one —— C19H25N3O4
    (9aR)-8-methyl-2-[2-(4-propanoylphenoxy)acetyl]-1,3,4,6,7,9a-hexahydropyrazino[1,2-a]pyrazin-9-one
    —— (9aS)-2-(1-methyl-4-phenylpiperidine-4-carbonyl)-1,3,4,7,8,9a-hexahydropyrazino[1,2-a]pyrazine-6,9-dione —— C20H26N4O3
    (9aS)-2-(1-methyl-4-phenylpiperidine-4-carbonyl)-1,3,4,7,8,9a-hexahydropyrazino[1,2-a]pyrazine-6,9-dione
    —— (9aR)-2-(1-methyl-4-phenylpiperidine-4-carbonyl)-1,3,4,7,8,9a-hexahydropyrazino[1,2-a]pyrazine-6,9-dione —— C20H26N4O3
    (9aR)-2-(1-methyl-4-phenylpiperidine-4-carbonyl)-1,3,4,7,8,9a-hexahydropyrazino[1,2-a]pyrazine-6,9-dione
    —— (9aS)-2-[2-[methyl(pyridin-4-ylmethyl)amino]acetyl]-3,4,6,7,8,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-9-one —— C16H23N5O2
    (9aS)-2-[2-[methyl(pyridin-4-ylmethyl)amino]acetyl]-3,4,6,7,8,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-9-one
    —— (9aS)-8-methyl-2-[2-oxo-6-(trifluoromethyl)-1H-pyridine-3-carbonyl]-3,4,7,9a-tetrahydro-1H-pyrazino[1,2-a]pyrazine-6,9-dione —— C15H15F3N4O4
    (9aS)-8-methyl-2-[2-oxo-6-(trifluoromethyl)-1H-pyridine-3-carbonyl]-3,4,7,9a-tetrahydro-1H-pyrazino[1,2-a]pyrazine-6,9-dione
    —— [(9aR)-8-methyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-2-yl]-(2-propylpyrazol-3-yl)methanone —— C15H25N5O
    [(9aR)-8-methyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-2-yl]-(2-propylpyrazol-3-yl)methanone
    —— (9aS)-N-ethyl-8-methyl-6,9-dioxo-3,4,7,9a-tetrahydro-1H-pyrazino[1,2-a]pyrazine-2-carboxamide —— C11H18N4O3
    (9aS)-N-ethyl-8-methyl-6,9-dioxo-3,4,7,9a-tetrahydro-1H-pyrazino[1,2-a]pyrazine-2-carboxamide
    —— (9aS)-2-[(2,5-dimethyl-1-pyridin-3-ylpyrrol-3-yl)methyl]-3,4,6,7,8,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-9-one —— C19H25N5O
    (9aS)-2-[(2,5-dimethyl-1-pyridin-3-ylpyrrol-3-yl)methyl]-3,4,6,7,8,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-9-one
    —— (9aR)-8-methyl-2-[2-oxo-6-(trifluoromethyl)-1H-pyridine-3-carbonyl]-3,4,7,9a-tetrahydro-1H-pyrazino[1,2-a]pyrazine-6,9-dione —— C15H15F3N4O4
    (9aR)-8-methyl-2-[2-oxo-6-(trifluoromethyl)-1H-pyridine-3-carbonyl]-3,4,7,9a-tetrahydro-1H-pyrazino[1,2-a]pyrazine-6,9-dione
    —— (9aR)-2-[(Z)-5-methyl-2-phenylhex-2-enyl]-1,3,4,7,8,9a-hexahydropyrazino[1,2-a]pyrazine-6,9-dione —— C20H27N3O2
    (9aR)-2-[(Z)-5-methyl-2-phenylhex-2-enyl]-1,3,4,7,8,9a-hexahydropyrazino[1,2-a]pyrazine-6,9-dione
    —— (9aR)-2-[[4-(diethylamino)-2-methylphenyl]methyl]-1,3,4,7,8,9a-hexahydropyrazino[1,2-a]pyrazine-6,9-dione —— C19H28N4O2
    (9aR)-2-[[4-(diethylamino)-2-methylphenyl]methyl]-1,3,4,7,8,9a-hexahydropyrazino[1,2-a]pyrazine-6,9-dione
    —— (9aS)-2-[2-(2-ethylsulfanyl-1,3-thiazol-4-yl)acetyl]-3,4,6,7,8,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-9-one —— C14H20N4O2S2
    (9aS)-2-[2-(2-ethylsulfanyl-1,3-thiazol-4-yl)acetyl]-3,4,6,7,8,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-9-one
    —— (9aS)-2-[[4-(diethylamino)-2-methylphenyl]methyl]-1,3,4,7,8,9a-hexahydropyrazino[1,2-a]pyrazine-6,9-dione —— C19H28N4O2
    (9aS)-2-[[4-(diethylamino)-2-methylphenyl]methyl]-1,3,4,7,8,9a-hexahydropyrazino[1,2-a]pyrazine-6,9-dione
    —— (9aR)-2-[2-(3,4-dihydro-1H-isoquinolin-2-yl)acetyl]-8-methyl-3,4,7,9a-tetrahydro-1H-pyrazino[1,2-a]pyrazine-6,9-dione —— C19H24N4O3
    (9aR)-2-[2-(3,4-dihydro-1H-isoquinolin-2-yl)acetyl]-8-methyl-3,4,7,9a-tetrahydro-1H-pyrazino[1,2-a]pyrazine-6,9-dione
    —— (9aR)-2-[2-(5-phenyltetrazol-2-yl)acetyl]-1,3,4,7,8,9a-hexahydropyrazino[1,2-a]pyrazine-6,9-dione —— C16H17N7O3
    (9aR)-2-[2-(5-phenyltetrazol-2-yl)acetyl]-1,3,4,7,8,9a-hexahydropyrazino[1,2-a]pyrazine-6,9-dione
    —— (9aS)-2-[3-(2-ethylbenzimidazol-1-yl)propanoyl]-1,3,4,7,8,9a-hexahydropyrazino[1,2-a]pyrazine-6,9-dione —— C19H23N5O3
    (9aS)-2-[3-(2-ethylbenzimidazol-1-yl)propanoyl]-1,3,4,7,8,9a-hexahydropyrazino[1,2-a]pyrazine-6,9-dione
    —— (9aR)-2-(2,3-dihydro-1H-inden-2-yl)-8-methyl-3,4,7,9a-tetrahydro-1H-pyrazino[1,2-a]pyrazine-6,9-dione —— C17H21N3O2
    (9aR)-2-(2,3-dihydro-1H-inden-2-yl)-8-methyl-3,4,7,9a-tetrahydro-1H-pyrazino[1,2-a]pyrazine-6,9-dione
    —— (9aR)-2-(3-fluoropyridine-4-carbonyl)-8-methyl-1,3,4,6,7,9a-hexahydropyrazino[1,2-a]pyrazin-9-one —— C14H17FN4O2
    (9aR)-2-(3-fluoropyridine-4-carbonyl)-8-methyl-1,3,4,6,7,9a-hexahydropyrazino[1,2-a]pyrazin-9-one
    —— (9aS)-2-[2-(5-phenyltetrazol-2-yl)acetyl]-1,3,4,7,8,9a-hexahydropyrazino[1,2-a]pyrazine-6,9-dione —— C16H17N7O3
    (9aS)-2-[2-(5-phenyltetrazol-2-yl)acetyl]-1,3,4,7,8,9a-hexahydropyrazino[1,2-a]pyrazine-6,9-dione
    —— (9aS)-8-methyl-2-(6-methyl-2-methylsulfanylpyrimidin-4-yl)-1,3,4,6,7,9a-hexahydropyrazino[1,2-a]pyrazin-9-one —— C14H21N5OS
    (9aS)-8-methyl-2-(6-methyl-2-methylsulfanylpyrimidin-4-yl)-1,3,4,6,7,9a-hexahydropyrazino[1,2-a]pyrazin-9-one
    —— (9aS)-2-(5-ethylthiophen-2-yl)sulfonyl-8-methyl-3,4,7,9a-tetrahydro-1H-pyrazino[1,2-a]pyrazine-6,9-dione —— C14H19N3O4S2
    (9aS)-2-(5-ethylthiophen-2-yl)sulfonyl-8-methyl-3,4,7,9a-tetrahydro-1H-pyrazino[1,2-a]pyrazine-6,9-dione
    —— (9aS)-2-[(Z)-5-methyl-2-phenylhex-2-enyl]-1,3,4,7,8,9a-hexahydropyrazino[1,2-a]pyrazine-6,9-dione —— C20H27N3O2
    (9aS)-2-[(Z)-5-methyl-2-phenylhex-2-enyl]-1,3,4,7,8,9a-hexahydropyrazino[1,2-a]pyrazine-6,9-dione
    —— (9aS)-2-[(E)-3-(5-chloro-2-hydroxyphenyl)-2-methylprop-2-enyl]-3,4,6,7,8,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-9-one —— C17H22ClN3O2
    (9aS)-2-[(E)-3-(5-chloro-2-hydroxyphenyl)-2-methylprop-2-enyl]-3,4,6,7,8,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-9-one
    —— (9aR)-2-[2-(2-ethylsulfanyl-1,3-thiazol-4-yl)acetyl]-3,4,6,7,8,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-9-one —— C14H20N4O2S2
    (9aR)-2-[2-(2-ethylsulfanyl-1,3-thiazol-4-yl)acetyl]-3,4,6,7,8,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-9-one
    —— (9aR)-2-(5-ethylthiophen-2-yl)sulfonyl-8-methyl-3,4,7,9a-tetrahydro-1H-pyrazino[1,2-a]pyrazine-6,9-dione —— C14H19N3O4S2
    (9aR)-2-(5-ethylthiophen-2-yl)sulfonyl-8-methyl-3,4,7,9a-tetrahydro-1H-pyrazino[1,2-a]pyrazine-6,9-dione
    —— (9aS)-8-methyl-N-[(3-methylphenyl)methyl]-9-oxo-1,3,4,6,7,9a-hexahydropyrazino[1,2-a]pyrazine-2-carboxamide —— C17H24N4O2
    (9aS)-8-methyl-N-[(3-methylphenyl)methyl]-9-oxo-1,3,4,6,7,9a-hexahydropyrazino[1,2-a]pyrazine-2-carboxamide
    —— (9aS)-2-(3-fluoropyridine-4-carbonyl)-8-methyl-1,3,4,6,7,9a-hexahydropyrazino[1,2-a]pyrazin-9-one —— C14H17FN4O2
    (9aS)-2-(3-fluoropyridine-4-carbonyl)-8-methyl-1,3,4,6,7,9a-hexahydropyrazino[1,2-a]pyrazin-9-one
    —— (9aS)-N-(3-chloro-4-methoxyphenyl)-8-methyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazine-2-carboxamide —— C16H23ClN4O2
    (9aS)-N-(3-chloro-4-methoxyphenyl)-8-methyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazine-2-carboxamide
    —— (9aR)-8-methyl-N-[(3-methylphenyl)methyl]-9-oxo-1,3,4,6,7,9a-hexahydropyrazino[1,2-a]pyrazine-2-carboxamide —— C17H24N4O2
    (9aR)-8-methyl-N-[(3-methylphenyl)methyl]-9-oxo-1,3,4,6,7,9a-hexahydropyrazino[1,2-a]pyrazine-2-carboxamide
    —— (9aR)-N-ethyl-8-methyl-6,9-dioxo-3,4,7,9a-tetrahydro-1H-pyrazino[1,2-a]pyrazine-2-carboxamide —— C11H18N4O3
    (9aR)-N-ethyl-8-methyl-6,9-dioxo-3,4,7,9a-tetrahydro-1H-pyrazino[1,2-a]pyrazine-2-carboxamide
    —— (9aS)-2-(2,3-dihydro-1H-inden-2-yl)-8-methyl-3,4,7,9a-tetrahydro-1H-pyrazino[1,2-a]pyrazine-6,9-dione —— C17H21N3O2
    (9aS)-2-(2,3-dihydro-1H-inden-2-yl)-8-methyl-3,4,7,9a-tetrahydro-1H-pyrazino[1,2-a]pyrazine-6,9-dione
    —— (9aS)-2-[2-(3,4-dihydro-1H-isoquinolin-2-yl)acetyl]-8-methyl-3,4,7,9a-tetrahydro-1H-pyrazino[1,2-a]pyrazine-6,9-dione —— C19H24N4O3
    (9aS)-2-[2-(3,4-dihydro-1H-isoquinolin-2-yl)acetyl]-8-methyl-3,4,7,9a-tetrahydro-1H-pyrazino[1,2-a]pyrazine-6,9-dione
    —— (9aR)-2-[3-(2-ethylbenzimidazol-1-yl)propanoyl]-1,3,4,7,8,9a-hexahydropyrazino[1,2-a]pyrazine-6,9-dione —— C19H23N5O3
    (9aR)-2-[3-(2-ethylbenzimidazol-1-yl)propanoyl]-1,3,4,7,8,9a-hexahydropyrazino[1,2-a]pyrazine-6,9-dione
    —— (9R)-1-methyl-9-(4-oxochromen-3-yl)-8,9-dihydro-6H-pyrido[3,2-g][1,4]benzoxazine-2,7-dione —— C21H16N2O5
    (9R)-1-methyl-9-(4-oxochromen-3-yl)-8,9-dihydro-6H-pyrido[3,2-g][1,4]benzoxazine-2,7-dione
    —— (9aR)-9-oxo-N-(4-phenylphenyl)-3,4,6,7,8,9a-hexahydro-1H-pyrazino[1,2-a]pyrazine-2-carboxamide —— C20H22N4O2
    (9aR)-9-oxo-N-(4-phenylphenyl)-3,4,6,7,8,9a-hexahydro-1H-pyrazino[1,2-a]pyrazine-2-carboxamide
    —— (9aR)-8-methyl-2-[(2-propan-2-ylpyrimidin-4-yl)methyl]-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazine —— C16H27N5
    (9aR)-8-methyl-2-[(2-propan-2-ylpyrimidin-4-yl)methyl]-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazine