Isolation and antibacterial activity of anomanol B and other secondary metabolites from the stem bark of (Annonaceae).

A new Lanosta-7,9(11),22-trien-3,15,20-triol named Anomanol B together with five known compounds: manniindole , arborinine , polycarpol 8,9-dimethoxyphenanthridin-6(5)-one and 3-O--D-glucopyranosyl--sitosterol were isolated from the stem bark extract of by routine chromatography techniques. 8,9-dimethoxyphenanthridin-6(5)-one was reported from natural origin for the first time. The structures of the compounds were established by comprehensive elucidation of spectroscopic data and by comparison with literature data.