Synonyms: 191152-96-2;Rifamycin, 3-((2-(4-carboxy-1-oxobutoxy)ethyl)thio)-1,4-dideoxy-1,4-dihydro-1,4-dioxo-, 5'-ester with 3'-azido-3'-deoxythymidine;Rifamycin, 3-[[2-(4-carboxy-1-oxobutoxy)ethyl]thio]-1,4-dideoxy-1,4-dihydro-1,4-dioxo-, 5'-ester with 3'-azido-3'-deoxythymidine