Crystallographic structure determination of the diterpenoid baccatin-V, a naturally occurring oxetan with a taxane skeleton

Abstract

Baccatin-V, C31H38O11, a new diterpenoid from Taxus baccata L. has been shown by X-ray analysis to contain an oxetan ring and to be 5β,20-epoxy-1β,2α,4α,7α,10β,13α-hexahydroxytax-11-en-9-one 4α,10β-diacetate 2α-benzoate (I).