1,2,3,6,7,8-Hexahydro-5-undecylpyrazino(2,3-g)quinoxaline 154324-54-6 2,3,4,7,8,9-Hexahydro-5-undecylpyrazino(2,3-g)quinoxaline Pyrazino(2,3-g)quinoxaline, 1,2,3,6,7,8-hexahydro-5-undecyl-