PROCESS FOR PRODUCING DIACYL DERIVATIVES OF RIFAMYCINS SUBSTITUTED WITH 4-(TRIALKYLBENZYL)-PIPERAZINYL GROUP AND PHARMACEUTICAL COMPOSITIONS COMPRISING SAME

摘要

Acylated 3-piperazinyl-substd. rifamycin derivs. of formula (I) and their salts are new: R= lower alkyl; R1= tri(lower alkyl) methylcarbonyl; one of R2 and R3 = tri (lower alkyl) methylcarbonyl and the other is H. - More specifically R=Me; R1 and one of R2and R3 = pivaloyl; the other is H.