11-bromo-2-methylfuro[3,2-b]xanthen-5-one

11-bromofuro[3,2-b]xanthen-5-one

11-bromo-2-methyl-2,3-dihydrofuro[3,2-b]xanthen-5-one

(4-bromo-9-oxo-2-prop-2-enylxanthen-3-yl) acetate