The alkaloids verazine, veratoylzygadenine, a base with mp 224-226°C, and a new alkaloid verazinine have been isolated from Zygadenus sibiricus (L). A. Gray. It has been established by chemical and spectral methods that verazinine is verazine 3-O-β-D-glycopyranoside. © 1985 Plenum Publishing Corporation.