1',2',13',13a'-tetrahydro-6'H-spiro[1,3-dioxolane-2,3'-pyrido[1',2':4,5]pyrazino[1,2-a]benzimidazole] InChI=1/C16H19N3O2/c1-2-4-14-13(3-1)17-15-10-18-11-16(20-7-8-21-16)6-5-12(18)9-19(14)15/h1-4,12H,5-11H2/t12-/m1/s spiro[1,3-dioxolane-2,3'(4'H)-[6H]pyrido[1',2':4,5]pyrazino[1,2-a]benzimidazole], 1',2',13',13'a-tetrahydro-, (13a'R)-