azocarmine G free acid
azocarmine g free acid
An organic heterotetracyclic compound that is 7-phenyl-5-imino-5,7-dihydrobenzo[<em>a</em>]phenazine-3-sulfonic acid in which the imino hydrogen is replaced by a 4-sulfophenyl group. The monosodium salt is the biological stain 'azocarmine G'.