Rasagiline-13C3 ((R)-AGN1135-13C3, TVP1012-13C3) mesylate is the deuterium labeled Rasagiline (mesylate) (HY-14605)[1]. Rasagiline (R-AGN1135) mesylate is a highly potent selective irreversible mitochondrial monoamine oxidase (MAO) inhibitor with IC50s of 4.43 nM and 412 nM for rat brain MAO B and A activity, respectively[2].