Structures of crassicauline B and crassicaulidine.

Two minor alkaloids, crassicauline B and crassicaulidine, were isolated from the roots of ACONITUM CRASSICAULE (1, 2). The structure of crassicauline B, C (27)H (31)O (4)N, is now deduced as ( 1), while the previously assigned structure of crassicaulidine has been further confirmed as ( 7) on the basis of chemical data and (13)C-NMR spectrum.