N-Demethylansamitocin P-3, a derivative of Ansamitocin, an antitumor ansamycin antibiotic, can be synthesized through the action of Streptomyces minutiscleroticus IFO 13361.
20-O-Demethyl-AP3 is a secondary metabolite derived from Ansamitocin P-3, and Ansamitocin P-3 is a macrocyclic antitumor antibiotic exerting its therapeutic effects by inhibiting microtubules.