| Abstract: | 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. |
