West African timbers. Part XXI. Extractives from Daniellia species. The structure of a new diterpene, ozic acid

Abstract

Extraction of the wood of Daniellia ogea with light petroleum gave a new diterpene acid, ozic acid (l; R = CO₂H) as well as the corresponding alcohol, ozol (l; R = CH₂OH). From the wood of D. oliveri we have isolated daniellic acid, a furanoid diterpene first obtained from the oleo-resin of the same tree. All the diterpenes so far isolated from the genus Daniellia belong to the antipodal stereochemical series with respect to the steroids.