The molecule is a carboxylic acid anion resulting from the deprotonation of all four carboxy groups and the protonation of both of the primary amino groups of selenodiglutathione. The major species at pH 7.3. It is a conjugate base of a selenodiglutathione.
(2S)-2-azaniumyl-5-[[(2R)-3-[(2R)-2-[[(4S)-4-azaniumyl-4-carboxylatobutanoyl]amino]-3-(carboxylatomethylamino)-3-oxopropyl]sulfanylselanylsulfanyl-1-(carboxylatomethylamino)-1-oxopropan-2-yl]amino]-5-oxopentanoate