Chemical constituents of Malagasy liverworts: Cyclomyltaylanoids from Bazzania madagassa

Five cyclomyltaylanoids (2-6), together with 1R,5R-diacetoxycyclomyltaylan-10-one (1), (+)-globulol, and ent-4,10-dihydroxyaromadendrane were isolated from Bazzania madagassa. The structure of 1 was confirmed by X-ray analysis, while those of the compounds were established on the basis of one- and two-dimensional NMR spectroscopic evidence, and comparison with data reported in the literature. The chemosystematics of B. madagassa are discussed.