191153-01-2 AIDS-058270 AIDS058270 Rifamycin analog Rifamycin,3-[[2-(3-carboxy-1-oxopropoxy)ethyl]thio]-1,4-dideoxy-1,4-dihydro-21,23-O-(1-methylethylidene)-1,4-dioxo-, 5'-ester with 3'-azido-3'-deoxythymidine