EFOMYCIN G, ITS PREPARATION AND ITS USE AS A YIELD PROMOTER IN ANIMALS

摘要

An animal growth promoter, efomycin G, is obtained by culturing Streptomycetes strain BS 1261. Efomycin G has the following properties: a) The empirical formula: C53H86O18 b) The mass spectrum (fast atom bombardment) Molecular weight + Na+: 1033 c) The 1H-nuclear magnetic resonance spectrum, stated in parts per million, shown in Figure 1. d) The 13C-nuclear magnetic resonance spectrum, stated in parts per million shown in Figure 2, with chemical shifts of the CC-NMR signals as follows: (ppm values are relative to tetramethylsilane at O ppm) e) A UV absorption maximum at 251 - 254 nm in methanolic solution. f) The structure according to Figure 3. Le A 24 398