What is the formula for diboron hexabromide?

B2Cl6 is the formula of diboron hexachloride.

'Di' = 2 and 'Hexa' = 6

However:

I could only find BCl3 (boron trichloride) or B2H6 (diborane) in my chemical text books, and one reaction with both of the last examples:

4 BCl3 + 3 LiAlH4 → 2 B2H6 + 3 LiAlCl4

but no confirmation of B2Cl6 molecules. So I doubt if it exists.