6-Fluoro-4-oxochroman6-Fluorochroman-4-one 98%2,3-Dihydro-6-fluoro-4H-1-benzopyran-4-one2,3-Dihydro-6-fluoro-4H-chromen-4-one6-Fluorochroman-4-one6-FLUORO-4-CHROMANONE6-Fluoro-4-chromanone6-Fluorochroman-4-one6-fluoro-3,4-dihydro-2H-1-benzopyran-4-one6-氟-4-二氢色原酮6-氟苯并二氢吡喃-4-酮