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Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
N-Acetylglucosamine (N-acetyl-D-glucosamine, or GlcNAc, or NAG) is a monosaccharide derivative of glucose. It is an amide between glucosamine and acetic acid. It has a molecular formula of C8H15NO6, a molar mass of 221.21 g/mol, and it is significant in several biological systems.
It is part of a biopolymer in the bacterial cell wall, built from alternating units of GlcNAc and N-acetylmuramic acid (MurNAc), cross-linked with oligopeptides at the lactic acid residue of MurNAc. This layered structure is called peptidoglycan (formerly called murein).
GlcNAc is the monomeric unit of the polymer chitin, which forms the outer coverings of insects and crustaceans. It is the main component of the cell walls of fungi, the radulas of mollusks, and the beaks of cephalopods.
Medical uses 
See also 
- Keratan sulfate
- N-acetyllactosamine synthase
- Wheat germ agglutinin, a plant lectin that binds to this substrate
- "Sugar supplement may treat immune disease - health - 07 June 2007 - New Scientist". Retrieved 2007-06-08.
- "Glucosamine-Like Supplement Suppresses Multiple Sclerosis Attacks, Study Suggests". Science Daily.