The molecule is a galactosamine sulfate that is N-acetyl-beta-D-galactosamine in which the hydroxy group at position 4 has been converted into its sulfate derivative. It derives from a N-acetyl-beta-D-galactosamine.
[(2R,3R,4R,5R,6R)-5-acetamido-4,6-dihydroxy-2-(hydroxymethyl)oxan-3-yl] hydrogen sulfate