| abstract |
NOVEL ACIDIC POLYCYLIC ETHER ANTIBIOTIC Abstract A new acidic polycyclic ether antibiotic, CP-63,517, having the formula: (I) and cationic salts thereof produced by submerged aerobic propagation of Streptomyces endus subsp. aureus, ATCC-39574, a new strain of microorganism isolated from a soil sample in Japan, a process for producing this antibiotic and methods for its use to improve feed utilization, promote growth of cattle and swine and to control coccidiosis. |