Docetaxel trihydrate Imp. C (EP): 1,7a,10ß-trihydroxy-9-oxo-5ß,20-epoxytax-11-ene-2a,4,13a-triyl 4-acetate 2-benzoate 13-[(2R,3S)-3-[[(1,1-dimethylethoxy)carbonyl]amino]-2-hydroxy-3-phenylpropanoate] (7-epi-docetaxel).