4-isoquinolinecarboxylic acid, 1,2-dihydro-1-oxo-, methyl ester InChI=1/C11H9NO3/c1-15-11(14)9-6-12-10(13)8-5-3-2-4-7(8)9/h2-6H,1H3,(H,12,13 methyl 1-oxo-1,2-dihydroisoquinoline-4-carboxylate