title: New antitumor substances of natural origin.
mesh_terms: D000818:Animals; D000903:Antibiotics, Antineoplastic / Q000627:therapeutic use*; D004353:Drug Evaluation, Preclinical; D005285:Fermentation; D051379:Mice; D013329:Structure-Activity Relationship
chemical_list: D000903:Antibiotics, Antineoplastic