Antibiotics DO-248-A and DO- 248-B of the following Formula I;
wherein R is ethyl or isopropyl, have antibacterial activity against acid-fast bacteria. DO-248-A, DO-248-B, or their pharmaceutically acceptable salts are, as an active ingredient of anit-fast-acid drugs, orally or parenterally administered to human beings or animal. DO-248-A and DO-248-B are prepared by incubating an antibiotic DO-248-A and/or DO-248-B-producing microorganism belonging to genus Streptoverticillium in a medium and recovering antibiotic DO-248-A and/or DO-248-B from the culture broth.
下式 I 的抗生素 DO-248-A 和 DO- 248-B;其中 R 是乙基或异丙基,具有抗无菌酸细菌的活性。 DO-248-A、DO-248-B 或它们的药学上可接受的盐,作为无菌酸药物的活性成分,可口服或肠外给药给人或动物。 DO-248-A 和 DO-248-B 是通过在
培养基中培养产生抗生素 DO-248-A 和/或 DO-248-B 的链霉菌属微
生物,并从培养液中回收抗生素 DO-248-A 和/或 DO-248-B 而制备的。