methyl 2-(2-oxo-1,3-dihydroindol-3-yl)acetate

12-hydroxy-12H-indolo[2,1-b]quinazolin-6-one

methyl 12-hydroxy-6-oxoindolo[2,1-b]quinazoline-12-carboxylate

3-hydroxy-3-(pyridin-2-ylmethyl)-1H-indol-2-one

methyl 2-ethyl-3-methyl-1-oxidoquinolin-1-ium-4-carboxylate