161935-14-4 3-(((4-Methyl-1-piperazinyl)imino)methyl)rifamycin mixt. with pyrazinecarboxamide and 4-pyridinecarboxylic acid hydrazide Rifamycin, 3-(((4-methyl-1-piperazinyl)imino)methyl)-, mixt. with pyrazinecarboxamide and 4-pyridinecarboxylic acid hydrazide Rifater