Diterpenes and norditerpenes from the Aristeguetia group

A reinvestigation of Aristeguetia buddleaefolia gave 16 new labdanes and two nor-labdanes, while A. glutinosa afforded, in addition to large amounts of 8,15-dihydroxylabdane, three new nor-labdanes. Badillao salicina gave six new cis-clerodanes and Grosvenoria rimbachii, guaianolides and tremetone derivatives, four of which were new. The structures were elucidated by high field NMR techniques and a few chemical transformations. The chemotaxonomy is discussed briefly.