An alkaloid derived from ipecac root. Irreversibly blocks protein synthesis by inhibiting the movement of ribosome along the mRNA. Induces hypotension by blocking adrenoreceptors. Inhibits DNA replication in the early S phase. Inhibits HIF-1 activation by hypoxia. Induces apoptosis in leukemia cells. Also, selectively inhibits multiple glioblastoma (GBM) stem cells-enriched cultures.