N-Acetylmuramic acid (NAM or MurNAc) is an organic compound with the chemical formula C11H19NO8.

It is a monomer of peptidoglycan in most bacterial cell walls, which is built from alternating units of N-acetylglucosamine (GlcNAc) and N-acetylmuramic acid, cross-linked by oligopeptides at the lactic acid residue of MurNAc.

N-Acetylmuramic acid (MurNAc) is part of the peptidoglycan polymer of bacterial cell walls.

A pentapeptide composed of L-alanyl-D-isoglutaminyl-L-lysyl-D-alanyl-D-alanine is added to the MurNAc in the process of making the peptidoglycan strands of the cell wall.

Therefore, both NAG and NAM are valuable polymers in medicinal research.