The molecule is a zwitterion resulting from the transfer of a proton for the carboxy group to the amino group of the L-gamma-glutamyl residue of S-methylglutathione. It is a conjugate acid of a S-methyl glutathione(1-). It is a tautomer of a S-methylglutathione.
(2S)-2-azaniumyl-5-[[(2R)-1-(carboxymethylamino)-3-methylsulfanyl-1-oxopropan-2-yl]amino]-5-oxopentanoate