13-(N-tert-butoxycarbonyl-3-isobutylisoserinoyl-4,10-diacetoxy-2-benzoyloxy-5-20-epoxy-1,13-dihydroxy-9-oxo-19-norcyclopropa(g)tax-11-ene
13-(n-tert-butoxycarbonyl-3-isobutylisoserinoyl-4,10-diacetoxy-2-benzoyloxy-5-20-epoxy-1,13-dihydroxy-9-oxo-19-norcyclopropa(g)tax-11-ene