The molecule is an amino-acid cation comprising psicosyllysine having a deprotonated carboxy group and both amino groups protonated; major species at pH 7.3. It is a conjugate acid of a psicosyllysine.
(2S)-2-azaniumyl-6-[[(3R,4R,5R)-3,4,5,6-tetrahydroxy-2-oxohexyl]azaniumyl]hexanoate