129791-92-0 3'-Hydroxy-5'-(4-isobutylpiperazinyl)benzoxazinorifamycin;Benzoxazinorifamycin AIDS-008521 AIDS008521 KRM 1648 KRM-1648 PA-1648 Rifalazil Rifamycin VIII, 1',4-didehydro-1-deoxy-1,4-dihydro-3'-hydroxy-5'-[4-(2-methylpropyl)-1-piperazinyl]-1-oxo-