The molecule is an S-substituted glutathione(1-) obtained by deprotonation of the the two carboxy groups and protonation of the amino group of S-(1-hydroxy-2-methylbut-3-en-2-yl)-glutathione; major species at pH 7.3. It is a conjugate base of a S-(1-hydroxy-2-methylbut-3-en-2-yl)glutathione.
(2S)-2-azaniumyl-5-[[(2R)-1-(carboxylatomethylamino)-3-(1-hydroxy-2-methylbut-3-en-2-yl)sulfanyl-1-oxopropan-2-yl]amino]-5-oxopentanoate