![5H-Pyrazino[2,3-b]indole](/structure/245-10-3.png)
![5H-Pyrazino[2,3-b]indole](/structure/245-10-3.png)
![(S)-7-phenylMethoxy-6,8-dioxo-3,4,6,8,12,12a-hexahydro-2H-pyrido[1',2':4,5]pyrazino[2,1-b][1,3]oxazine-9-carboxylic acid Methyl ester](/structure/1357289-10-1.png)
![2H-Pyrazino[1,2-a]pyrimidin-2-one,3,4-dihydro-](/structure/781552-10-1.png)
![10-chloro-5,6-dihydro-4H-pyrazino[3,2,1-jk]carbazole hydrochloride](/structure/102129-10-2.png)
10-chloro-5,6-dihydro-4H-pyrazino[3,2,1-jk]carbazole hydrochloride
![Pyrazino[2,1-c][1,4]oxazin-9(6H)-one, hexahydro-](/structure/929047-10-9.png)

2(1H)-Pyrazinone, 1-(cyclohexylcarbonyl)-3,4-dihydro-4-(2-phenylethyl)-
![Pyrazino[2,3-d]pyridazine-5,8-dione, 6,7-dihydro-2,3-dimethyl-](/structure/122942-10-3.png)
Pyrazino[2,3-d]pyridazine-5,8-dione, 6,7-dihydro-2,3-dimethyl-
![5H-Indolo[3''',2''':4'',5'']azocino[1'',2'':4',5']pyrazino[1',2':1,5]pyrrolo[2,3-b]indole-10,18(6H,10aH)-dione,11,11a,16,16a-tetrahydro-11a-hydroxy-6,6-dimethyl-16-(3-methyl-2-buten-1-yl)-,(10aR,11aR,16aS)-](/structure/220525-10-0.png)
![L-Prolinamide,L-valyl-N-[(3S,6S)-6-[(4-chlorophenyl)methyl]-1-[(2,4-dichlorophenyl)sulfonyl]octahydro-8-(1-methylethyl)-4,7-dioxo-2H-pyrazino[1,2-a]pyrimidin-3-yl]-](/structure/878274-10-3.png)
![2H-Pyrazino[2,1-a]isoquinolin-4-ol,2-(cyclohexylcarbonyl)-1,3,4,6,7,11b-hexahydro-](/structure/143246-48-4.png)
2H-Pyrazino[2,1-a]isoquinolin-4-ol,2-(cyclohexylcarbonyl)-1,3,4,6,7,11b-hexahydro-
![Dibenzo[g,g']pyrazino[2,3-b:5,6-b']diquinoxaline,6,15-dihydro- (9CI)](/structure/102134-10-1.png)
Dibenzo[g,g']pyrazino[2,3-b:5,6-b']diquinoxaline,6,15-dihydro- (9CI)
![5H-Pyrazino[2,3-d]azepin-2-amine,7-ethyl-6,7,8,9-tetrahydro-9-methyl-](/structure/763880-10-0.png)
5H-Pyrazino[2,3-d]azepin-2-amine,7-ethyl-6,7,8,9-tetrahydro-9-methyl-


![4-(2,3,4,4a,5,6-Hexahydro-1H-pyrazino[1,2-a]quinolin-3-yl)pyridin-3-amine](/structure/27114-10-9.png)
4-(2,3,4,4a,5,6-Hexahydro-1H-pyrazino[1,2-a]quinolin-3-yl)pyridin-3-amine
![9-bromo-2,3-dimethyl-3,4-dihydro-1H-pyrazino[2,1-b]quinazoline-6(2H)-one](/structure/1312455-10-9.png)
9-bromo-2,3-dimethyl-3,4-dihydro-1H-pyrazino[2,1-b]quinazoline-6(2H)-one

2(1H)-Pyrazinone,3-(cyclohexylmethyl)-6-(1H-indol-3-ylmethyl)-5-methoxy-, 4-oxide
![3-(3,4,6,7,12,12a-hexahydropyrazino[1',2':1,6]pyrido[3,4-b]indol-2(1H)-yl)propanenitrile](/structure/42021-48-7.png)
3-(3,4,6,7,12,12a-hexahydropyrazino[1',2':1,6]pyrido[3,4-b]indol-2(1H)-yl)propanenitrile
![1H-Pyrazino[1,2-a]quinoxalin-5(6H)-one,8-fluoro-2,3,4,4a-tetrahydro-3-[2-(4-pyridinyl)ethyl]-](/structure/75704-10-8.png)
1H-Pyrazino[1,2-a]quinoxalin-5(6H)-one,8-fluoro-2,3,4,4a-tetrahydro-3-[2-(4-pyridinyl)ethyl]-
![2H-Pyrazino[2,1-b]quinazoline-3,6(1H,4H)-dione,1,4-dimethyl-2-(phenylmethyl)-, (1R,4R)-rel-](/structure/216596-48-4.png)
2H-Pyrazino[2,1-b]quinazoline-3,6(1H,4H)-dione,1,4-dimethyl-2-(phenylmethyl)-, (1R,4R)-rel-
![5-Pyrimidinecarboxylic acid,4-[[(3-chloro-4-methoxyphenyl)methyl]amino]-2-(octahydro-6,9-dioxo-2H-pyrazino[1,2-a]pyrazin-2-yl)-, ethyl ester](/structure/372115-48-5.png)
![6H-Pyrazino[1,2-c]pyrimidin-6-one, 7-ethyloctahydro-2-(2-phenylethyl)-](/structure/56926-10-4.png)
6H-Pyrazino[1,2-c]pyrimidin-6-one, 7-ethyloctahydro-2-(2-phenylethyl)-
![3-methylpyrazino[2,3-d][1,2,4]triazolo[4,3-b]pyridazin-6-amine](/structure/81450-48-8.png)
3-methylpyrazino[2,3-d][1,2,4]triazolo[4,3-b]pyridazin-6-amine
![N-[2-(3,4,6,7,12,12a-hexahydropyrazino[1',2':1,6]pyrido[3,4-b]indol-2(1H)-yl)ethyl]-4-methoxybenzamide](/structure/72593-10-3.png)