The molecule is a glutathione derivative in which the thiol hydrogen of glutathione is replaced by a 1-hydroxy-2-methylbut-3-en-2-yl group. It is a conjugate acid of a S-(1-hydroxy-2-methylbut-3-en-2-yl)glutathione(1-).
(2S)-2-amino-5-[[(2R)-1-(carboxymethylamino)-3-(1-hydroxy-2-methylbut-3-en-2-yl)sulfanyl-1-oxopropan-2-yl]amino]-5-oxopentanoic acid