39161-52-9 5,6-Dihydro-6-oxophenanthridine-3-carboxylic acid 5-22-06-00430 (Beilstein Handbook Reference) Acido 6-fenantridon-3-carbossilico [Italian] BRN 0479459 Phenanthridine-3-carboxylic acid, 5,6-dihydro-6-oxo-