148236-03-7 25-Deacetyl-krm-1648 Krm 1671 Krm-1671 Rifamycin viii, 25-O-deacetyl-1',4-didehydro-1-deoxy-1,4-dihydro-3'-hydroxy-5'-(4-(2-methylpropyl)-1-piperazinyl)-1-oxo-