title: The maytansinoids. Isolation, structural elucidation, and chemical interrelation of novel ansa macrolides.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D008453:Maytansine / Q000031:analogs & derivatives / Q000302:isolation & purification*; D010078:Oxazines / Q000302:isolation & purification*
chemical_list: D010078:Oxazines; D008453:Maytansine