Lignans and Kauranes from the Stems of Annona cherimola

Four lignans and six kauranes, (+)‐epi‐syringaresinol (1), annocherin A (16β‐hydroxy‐17,19‐diacetoxy‐ent‐kaurane) (2), (+)‐syringaresinol (3), (+)‐dia‐syringaresinol (4), liriodendrin[(+)‐syringaresinol‐di‐O‐β‐D‐glucopyranoside] (5), 16α‐hydro‐17‐acetoxy‐ent‐kauran‐19‐oic acid (6), 16β‐hydro‐17‐hydroxy‐ent‐kauran‐19‐al (7), 16α‐hydro‐17‐hydroxy‐ent‐kauran‐19‐al (8), 16β‐hydro‐17‐hydroxy‐ent‐kauran‐19‐oic acid (9) and 16α‐hydro‐17‐hydroxy‐ent‐kauran‐19‐oic acid (10) were isolated from the stems of Annona cherimola. Among them, 1 is obtained for the first time from natural sources and 2 is a new compound. The structures of these compounds were characterized and identified by spectral analyses.