(13aS)-5,8,13,13aα-Tetrahydro-3,10,11-trimethoxy-6H-dibenzo[a,g]quinolizin-2-ol

Corydalis govaniana yields this alkaloid, the structure of which has been determined from chemical and spectroscopic data. Treatment with CH2N 2 yields (-)- norcorydaldine which establishes the configuration at C-13a as S.

Mehra et ai., J. Chern. Soc., B, 14,58 (1976)