Antibiotic A-21978 mixtures, in particular the A-21978C mixture, comprising microbiologically active, related factors Co, C1, C2, C3, C4, and Cs. A-21978 mixture and A-21978C mixture are produced by submerged aerobic fermentation of Streptomyces roseosporus NRRL 11379. The individual A-29178C factors are separated and isolated by chromatography. The A-21978 and A-2f978C mixtures; the A-21978C factors; and pharmaceutically acceptable salts thereof are antibacterial agents and improve growth promotion in poultry.
抗生素 A-21978 混合物,特别是 A-21978C 混合物,由具有微
生物活性的相关因子 Co、C1、C2、C3、C4 和 Cs 组成。 A-21978 混合物和 A-21978C 混合物是通过玫瑰孢链霉菌 NRRL 11379 的浸没有氧发酵产生的。 单个 A-29178C 因子通过色谱法分离。 A-21978 和 A-2f978C 混合物、A-21978C 因子及其药学上可接受的盐是抗菌剂,可改善家禽的生长促进作用。