has role vincristine(2+) formamides methyl ester tertiary alcohol vinca alkaloid vincaleukoblastine vincristine A vinca alkaloid with formula C46H56N4O10 found in the Madagascar periwinkle, Catharanthus roseus. It is used (commonly as the corresponding sulfate salt)as a chemotherapy drug for the treatment of leukaemia, lymphoma, myeloma, breast cancer and head and neck cancer. antineoplastic agent organic heterotetracyclic compound organic heteropentacyclic compound acetate ester tertiary amino compound microtubule-destabilising agent plant metabolite