When a suspension of 2, 4, 6-tribromophenol is treated with an excess of bromine water, the white

Question:

When a suspension of 2, 4, 6-tribromophenol is treated with an excess of bromine water, the white precipitate of 2, 4, 6-tribromophenol disappears and is replaced by a precipitate of a yellow compound that has the following structure. Give a curved-arrow mechanism for the formation of this compound.