Known diterpenoid maoyerabdosin was isolated from the leaves of Rabdosia macrocalyx (Dunn) Hara.Based on elemental analyses and spectra of MS,NMR,COSY and NOESY,the structure of maoyerabdosin was revised as ent 7β 20 epoxy 1α,7α,15α,16α tetrahydro xy kaurene 6α,17 diacetate.
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