| 摘要 |
NEW MATERIAL:The B572-A1, B572-A2, B572-B and B572-C substances having the following physical and chemical properties. (A) B572-A1 substance: molecular weight, 548; ultraviolet absorption spectrum, endabsorption. (B) B572-A2 substance: molecular weight, 605; ultraviolet absorption spectrum, endabsorption. (C) B572-B substance: molecular weight, 589; ultraviolet absorption spectrum, endabsorption. (D) B572-C substance: ultraviolet absorption spectrum, endabsorption; etc. USE:Antitumor agent. PREPARATION:A bacterial strain belonging to Flexibacter genus and capable of producing B572-A1, B572-A2, B572-B and B572-C substances [preferably Flexibacter sp B572 strain (FERM P-8738)] is cultured at 24-28 deg.C and 6-8pH for 2-10 days preferably under aerobic condition. |
