2H-1-Benzopyran-2-one, 4-(bromomethyl)-6,7-dimethoxy- 4-(Bromomethyl)-6,7-dimethoxy-2-oxo-2H-benzopyran 4-Bdmc 4-Bromomethyl-6,7-dimethoxycoumarin 88404-25-5 Brdmc-4,6,7