9-Acyl tylosin derivatives.

摘要

9-0-Acyltylosin derivatives of formula <CHEM> where R is a C2-7 alkanoyl or benzoyl group optionally substituted by C1-4 alkyl, C1-4 alkoxy, nitro or halo; where R<1> is hydrogen or mycarosyl; and R<2> is mycinosyl; or a pharmaceutically-acceptable salt thereof; are effective antibacterial agents.