10-Deacetyl baccatin III dimethyl sulfoxide disolvate.

The title compound, C29H36O10·2C2H6OS, forms a monoclinic crystal containing two hydrogen-bonded di­methyl sulfoxide mol­ecules per 10-de­acetyl baccatin III. The lattice is further stabilized by two additional hydrogen bonds and a dipole–dipole interaction. A comparison of 10-de­acetyl baccatin III with the structurally similar docetaxel reveals differences primarily in the benzoyl moiety, while comparisons to baccatin III identify relative differences principally in the cyclo­octane- and cyclo­hexane-ring conformations.