6-chloro-4-(chloromethyl)-7-hydroxy-2H-chromen-2-one
(6-bromo-7-hydroxycoumarin-4-yl)methyl phenylacetate
6-bromo-7-hydroxy-4-(2-methyl-2-phenyl-[1,3]dioxolan-4-yl)-chromen-2-one
4-(6-bromo-7-hydroxycoumarin-4-yl)-2-phenyl-1,3-dioxolane
(6-bromo-7-hydroxycoumarin-4-yl)methyl 4-nitrophenyl carbonate