Chemical examination of the ethyl acetate extract of the roots of Rhizophora mucronata collected from Mangalore Coast resulted in the isolation of three more new diterpenoids, rhizophorins C-E ( 1 - 3 ) in addition to the two, rhizophorin A, (6 R ,11 S ,13 S )-6,11,13-trihydroxy-2,3-seco-14-labden-2,8-olid-3-oic acid, and rhizophorin B, ent -3 g; ,20-epoxy-3 f; ,18-dihydroxy-15-beyerene, recently reported. The structures of the new diterpenoids have been elucidated by a study of their physical and spectral data as 17-hydroxybeyer-15-en-3-one ( 1 ), 3 g; ,17-diacetoxy-15-beyeren-2-one ( 2 ) and 3 g; ,6 f; -diacetoxy-8(14),15-isopimaradien-2-one ( 3 ).
Journal of Asian Natural Products Research
Volume 4, 2002 - Issue 1
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