Abstract
Three new labdane diterpenes were isolated together with four known diterpenes [(E)-labda-8(17),12-diene-15,16-dial, coronarin B and D, and isocoronarin D] from rhizomes of Hedychium coronarium. The structures of the new compounds were determined by spectroscopic evidence to be labda-8(17), 11,13-trien-15(16)-olide, an ester of labda-8(17), 11,13-trien-15-al-16-oic acid and isocoronarin D, and 7β-hydroxycoronarin B.
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