title: Ansamitocin, a group of novel maytansinoid antibiotics with antitumour properties from Nocardia.
mesh_terms: D000818:Animals; D000903:Antibiotics, Antineoplastic / Q000032:analysis / Q000302:isolation & purification* / Q000627:therapeutic use; D007942:Leukemia, Experimental / Q000188:drug therapy; D008453:Maytansine / Q000031:analogs & derivatives / Q000032:analysis / Q000302:isolation & purification* / Q000627:therapeutic use; D051379:Mice; D009615:Nocardia / Q000032:analysis*; D010078:Oxazines / Q000302:isolation & purification*
chemical_list: D000903:Antibiotics, Antineoplastic; D010078:Oxazines; D008453:Maytansine