Chinese name: Homoharringtonine alkali Chinese alias: high Cephalotaxus base, Houmohalin alkali English name: Omacetaxine; Homoharringtonine CAS Registry Number: 26833-87-4 Formula: C29H39NO9 Molecular Weight: 545.62 Appearance: Homoharringtonine bases white or slightly yellow crystalline powder Purity: ≥98% Extract Source: Cephalotaxus Cephalotaxus fortunei. Purpose: Homoharringtonine base for determination, identification, pharmacological experiments. Storage: 4 ℃ cold storage, sealed, dark period: 2 years pharmacodynamics: Homoharringtonine base cycle non-specific antineoplastic agents. Make ribosomes depolymerization, inhibition of protein synthesis, the tumor mitotic index decreased tumor tissue nucleic acid content decreased, mainly used in clinical acute promyelocytic leukemia, acute monocytic leukemia, acute myeloid leukemia and malignant lymphoma . It can also be used for chronic myeloid leukemia, polycythemia vera psychosis.