3-acetyl-2-methylchromen-4-one

1H-chromeno[3,2-c]pyrazol-9-one

3,3a-dihydro-9-oxo-9H-furo[3,4-b][1]benzopyran

色酮-3-甲酸

3-(hydroxymethyl)-4-oxo-4H-1-benzopyrane