Docetaxel-d5 (trihydrate) is the deuterium labeled Docetaxel (Trihydrate). Docetaxel Trihydrate (RP-56976 Trihydrate) is an antineoplastic agent and inhibits microtubule?depolymerization with an IC50 value of 0.2 µM[1]. Docetaxel Trihydrate is a semisynthetic analog of taxol and attenuates the effects of?bcl-2?and?bcl-xL?gene expression. Docetaxel Trihydrate arrests the cell cycle at G2/M and leads to cell apoptosis[1][3].