4-Methyl-2-oxo-2,7-dihydro-1-oxa-7,9,10-triaza-benzo[c]fluor ene-8,11-dicarboxylic acid dimethyl ester or 9,10- Diaza-4-methyl-8,11-bis(methoxycarbonil) benzopyrrolo[2,7-H] coumarin NSC723932