2-(5-Oxo-5,6-dihydro-benzo[c][2,7]naphthyridin-4-yl)-nicotinic acid methyl ester 3-pyridinecarboxylic acid, 2-(5,6-dihydro-5-oxobenzo[c][2,7]naphthyridin-4-yl)-, methyl ester InChI=1/C19H13N3O3/c1-25-19(24)13-6-4-9-20-16(13)17-15-12(8-10-21-17)11-5-2-3-7-14(11)22-18(15)23/h2-10H,1H3,(H,22,23 Subarine methyl 2-(5-oxo-5,6-dihydrobenzo[c]-2,7-naphthyridin-4-yl)nicotinate