| 摘要 |
<p>This invention relates to novel acidic polycyclic ether antibiotics CP-91,243 and CP-91,244 of formula (III) wherein R is H in CP-91,243 and R is CH3 in CP-91,244. The invention also relates to novel Actinomadura roseorufa microorganisms; processes for producing the novel antibiotics and the known antibiotic UK-58,852; methods for controlling coccidial infections in poultry, enteritis in livestock and swine dysentery; methods for promoting growth and/or improving efficiency of feed utilization in ruminant or monogastric animals; and nutrient feed compositions.</p> |
