Abstract
Four 9- epi- ent-labdanes were isolated from the aerial parts of Calceolaria inamoena. Their structures, 2β-hydroxy-9- epi-ent-labda8(17)-13( E)dien-15-oic acid, 2β-hydroxy-9- epi-ent-labda8(17)-13( Z)dien-15-oic acid, 2β-hydroxy-9- epi-ent-labda8(17)-13( E)dien-15-al and 2β-hydroxy-9- epi-ent-labda-8(17)-13( Z)dien-15-al, were established by spectroscopic methods including by analysis of 2 dimensional heteronuclear correlation experiments 1H/ 13C (normal and long range), and NOE and gs-sel-1D-NOESY and TOCSY of their methyl ester or acetyl derivatives.
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