The roots of Aconitum monticola have yielded songorine, songaramine, norsongorine, an amorphous base with the composition C22H35NO6, a base C22H33NO6 with mp 166-167°C, a base C22H33NO5 with mp 161-164°C, and the new alkaloid acomonine. The structure of acomonine has been established on the basis of chemical transformations and spectral properties: It consists of a lycoctonine nucleus with an α-hydroxy group at C3, an α-methoxy group at C10, β-methoxy groups at C6 and C15, an α-glycol system at C7 and C8, and a methoxy group at C19. © 1976 Plenum Publishing Corporation.