Docetaxel-d 5 (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. 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.