(S)-Rasagiline (TVP1022) is the relatively inactive S-enantiomer form of Rasagiline. Rasagiline is a highly potent selective irreversible MAO inhibitor with IC50s of 4.43 nM and 412 nM for rat brain MAO B and A activity, respectively. (S)-Rasagiline is a click chemistry reagent, it contains an Alkyne group and can undergo copper-catalyzed azide-alkyne cycloaddition (CuAAc) with molecules containing Azide groups.