1H-pyrrolo[2,3-f]quinoline-2-carboxylic acid, 4,5-dihydroxy- 4,5-dihydroxy-1H-pyrrolo[2,3-f]quinoline-2-carboxylic acid InChI=1/C12H8N2O4/c15-10-6-4-7(12(17)18)14-8(6)5-2-1-3-13-9(5)11(10)16/h1-4,14-16H,(H,17,18