ISOLATION AND STRUCTURES OF HELIOSCOPINOLIDES, NEW DITERPENES FROMEUPHORBIA HELIOSCOPIAL.

Three new diterpenes, helioscopinolides A, B and C, have been isolated from the plant Euphorbia helioscopia L., and their stereostructures also been elucidated on the basis of their spectral and chemical data coupled with an X-ray crystallographic analysis of helioscopinolide A.