5,6,10B,11-TETRAHYDRO-3-METHYL-SPIRO(12H-BENZO(A)FURO(3,4-F)QUINOLIZINE-12,2'-(1,3)DITHIOLAN)-1(3H)-ONE, (3R-CIS)-
5,6,10b,11-tetrahydro-3-methyl-spiro(12h-benzo(a)furo(3,4-f)quinolizine-12,2'-(1,3)dithiolan)-1(3h)-one, (3r-cis)-