1-oxo-1,2-dihydroisoquinoline-4-carboxylic acid 4-isoquinolinecarboxylic acid, 1,2-dihydro-1-oxo- InChI=1/C10H7NO3/c12-9-7-4-2-1-3-6(7)8(5-11-9)10(13)14/h1-5H,(H,11,12)(H,13,14