3-methyl-1-phenyl-2H-pyrazolo[4,3-c]quinolin-4-one

4-hydroxy-3-phenyl-10H-pyrano[2,3-b]quinoline-2,5-dione

3-benzyl-4-hydroxy-10H-pyrano[2,3-b]quinoline-2,5-dione

4-hydroxy-3-phenyl-6H-pyrano[3,2-c]quinoline-2,5-dione

2,4-dimethoxyquinoline