| 摘要 |
A FO-1289 substance of the formula <IMAGE> wherein R1, R2, R3 and R4 are hydrogen or acyl. A process for the production thereof comprises culturing the novel microorganism Aspergillus sp. FO-1289 FERM BP-4242 in a nutrient medium, accumulating the FO-1289 substance thus produced in the medium, and isolating the FO-1289 substance therefrom. Particular species of the FO-1289 substance comprise FO-1289A, in which R1, R2 and R3 are acetyl and R4 is hydrogen; FO-1289B, wherein R1 is propionyl, R2 and R3 are acetyl and R4 is hydrogen; FO-1289C, wherein R1 and R3 are acetyl, R2 is propionyl and R4 is hydrogen; and FO-1289D, wherein R1 and R2 are acetyl, R3 is propionyl and R4 is hydrogen. |
