4-Methylumbelliferyl phosphate (4-MUP) is a fluorogenic substrate of alkaline phosphatases.

Bretylium tosylate is an inhibitor of the presynaptic release of vasoconstrictor neurotransmitters a available antiarrhythmic drug for ventricular arrhythmias.

2-broMobenzene-1,3,5-triol is a marine derived natural products found in Rhabdonia verticillata.