THE BATTLE OF THE HYDROXIDES AND BROMIDES IN THE PRESENCE OF ALUMINIUM CHLORIDE, DEITY OF WAR, DISEMBOWELLING A BENZENE RING

I had my problems with Biology
That is why I left the field
But Biology is far better
Than those damned letters
P, V, N, R and T.

Quantum Chemistry and Physics were worse I guess, and don't even get me started on Mathematics.

Written to "Under Pressure" by Queen and David Bowie.