Diterpenes and umbelliferone derivatives from Haplopappus deserticola

Abstract

The aerial parts of Haplopappus deserticola afforded three ent-labdane and one labdane derivative as well as a nor-ent-labdane. Furthermore, in addition to three known umbelliferone derivatives, a dimeric coumarin was isolated. The structures were elucidated by high field 1H NMR spectroscopy. © 1990.