The molecule is an S-substituted glutathione(1-) resulting from the protonation of the primary amino group and the deprotonation of both of the carboxy groups of S-methyl glutathione. The major microspecies at pH 7.3. It is a S-substituted glutathione(1-) and a methyl sulfide. It derives from a glutathionate(1-). It is a conjugate base of a S-methylglutathione zwitterion.
(2S)-2-azaniumyl-5-[[(2R)-1-(carboxylatomethylamino)-3-methylsulfanyl-1-oxopropan-2-yl]amino]-5-oxopentanoate