Baccatin

14,17-Epidioxy-28-r-15-taraxerene-2,3-diol

14,17-Epidioxy-28-nor-15-taraxerene-2,3-diol

(14ξ,17ξ)-14,17-Epidioxy-28-nor-D-friedo-5α-olean-15-ene-2α,3β-diol