methyl 2,5-dimethyl-4-(2-nitrophenyl)furan-3-carboxylate

1,3-dimethyl-5H-furo[3,4-c]quinolin-4-one

1-[2-(2-nitrophenyl)-[1,3]oxazolo[5,4-b]indol-4-yl]ethanone

1-methyl-3-phenylpyrazolo[3,4-b]quinoline

1,3-diphenylpyrazolo[3,4-b]quinoline