Diterpenoids from Premna integrifolia

Three new diterpenoids 1β,3α,8β-trihydroxy-pimara-15-ene (1), 6α,11,12,16-tetrahydroxy-7-oxo-abieta-8,11,13-triene (2) and 2α,19-dihydroxy-pimara-7,15-diene (3) were isolated from the root bark of Premna integrifolia and their structures were elucidated largely from their 1D and 2D NMR data.