1-Carboxylic acid phenazine 1-Phenazinecarboxylic acid 1144-02-1 2538-68-3 5-25-05-00176 (Beilstein Handbook Reference) BRN 0183818 EMR 211 [Russian] NRRL B-1482 [Russian] NRRL B-1576 [Russian] NSC 15851 Phenazinecarboxylic acid