Docetaxel is a semi-synthetic taxane antineoplastic agent used in chemotherapy to treat various cancers, including breast cancer, non-small cell lung cancer, advanced prostate cancer, and gastric cancer. It works by binding to tubulin and stabilizing microtubules, which interferes with the mitotic spindle formation and prevents cancer cell division, leading to cell death. This high-purity analytical reference standard (≥99% by HPLC) is intended for laboratory use in pharmaceutical research, quality control, method development, and calibration, not for direct clinical administration.