method for preparing a antibioti cum and medicines that contain this antibioti cum.

摘要

Acylation of the antibiotic which is known under the name XK-62-2 and has the formula A IMAGE in which R6 is hydrogen with a compound of the formula Y1Y2N-CH2-CH2-CHOH-COZ initially results in a mixture of various acylated compounds from which the required compound with the group IMAGE is isolated, and the protective group Y2 is removed before or after the isolation. The antibiotic has a broad spectrum of antibacterial activity, especially against Escherichia coli KY 8327 and 8348.