4-benzoyl-6-hydroxy-1-(2-phenylethyl)piperazin-2-one

4-benzoyl-1-(2-phenylethyl)piperazine-2,6-dione

2-acetyl-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinolin-4-one

(-)-2-Benzoyl-4-oxo-1,2,3,6,7,11b-hexahydro-4H-pyrazino[2,1-a]isoquinoline

3,4-二氢异喹啉