abstract |
The invention relates to novel acidic polycyclic ether antibiotics CP-91,243 and CP-91,244 of formula. where R is H in CP-91,243 and R is CHi CP-91,244. The invention also relates to novel Actinomadura roseorufa microorganisms; processes for the preparation of the new antibiotics and the known antibiotic UK-58,852; methods for controlling coccidia infections in poultry, enteritis in livestock and swine dysentery; methods for promoting growth and / or improving pre-utilization in ruminants or monogastric animals; and f ersammensetr.inger. |