Aloin, a natural anthracycline from Aloe vera, is a tyrosinase inhibitor.

Eltoprazine dihydrochloride is a drug that had previously been developed for aggression has recently been investigated for L-DOPA-induced dyskinesia in animal models of Parkinson′s disease (PD) and in dyskinetic PD patients.?

2-Hydroxy-3-methoxybenzoic acid glucose ester shows a potent antagonistic activity against platelet activating factor (PAF), it can prevent the mice from the PAF-induced death at a dose of 300 micrograms/mouse.