4,5-dihydro-7-nitro-4-oxo-8-(3-carboxypyrrol-1-yl)-1,2,4-triazolo(1,5-a)quinoxaline-2-carboxylic acid
4,5-dihydro-7-nitro-4-oxo-8-(3-carboxypyrrol-1-yl)-1,2,4-triazolo(1,5-a)quinoxaline-2-carboxylic acid