1,2,7,8,9,10-Hexahydro-2-oxo-3H-pyrazino(3,2,1-jk)carbazole-3-acetic acid methyl ester 3H-Pyrazino(3,2,1-jk)carbazole-3-acetic acid, 1,2,7,8,9,10-hexahydro-2-oxo-, methyl ester 5-24-04-00059 (Beilstein Handbook Reference) 67766-95-4 BRN 0847287