THREE NEW DITERPENOIDS FROM THE BARK OF Ptychopetalum olacoides

摘要

A phytochemical constituent investigation of the bark of Ptychopetalum olacoides led to the isolation of three new diterpenoides, named ptycholactone (1), 3(R)-hydroxysarcopetaloic acid (2), and 2 beta,3 beta-dihydroxylabda-8(17),12(1),14(15)-triene (3). The structures of 1, 2, and 3 were elucidated by analyzing spectroscopic data and comparing their NMR data with those of the previously reported compounds 2a and 3a.