1-p-methoxybenzylcarbonyl-3-(2'-hydroxybenzoyl)-benzo[b]indolizine

2-(N-methylanilino)-4-oxochromene-3-carbaldehyde

3-(anilinomethylidene)chromene-2,4-dione

dimethyl 10-oxo-2-phenyl-3,10-dihydro-2H-chromeno[3,2-c]pyridine-3,4-dicarboxylate