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-methylthio glutathione. The major microspecies at pH 7.3. It derives from a glutathionate(1-).
(2S)-2-azaniumyl-5-[[(2R)-1-(carboxylatomethylamino)-3-(methyldisulfanyl)-1-oxopropan-2-yl]amino]-5-oxopentanoate