2-aminochromeno[4,3-d]pyrimidin-4-one

methyl 4-oxochromene-3-carboxylate

2-甲基苯并二氢吡喃-4-酮

1-phenylchromeno[4,3-c]pyrazol-4-one

4-氧代-4H-1-苯并吡喃-2-甲酰氯