<unk>  is a dicarboxylic<unk> .  There are three isomeric forms designated trans,trans-muconic<unk> , cis,trans-muconic<unk> , and cis,cis-muconic<unk>  which differ by the geometry around the double bonds.
trans,trans-Muconic<unk>  is a metabolite of benzene in humans.  The determination of its concentration in urine is therefore used as a biomarker of occupational or environmental exposure to benzene.  Synthetically, trans,trans-muconic<unk>  can be prepared from adipic<unk> .
cis,cis-Muconic<unk>  is produced by some bacteria by the enzymatic degradation of various aromatic chemical compounds.
Muconic acid
Mucin
Lecithin
Pectin
Glycoprotein
Beta-glucan
Monosaccharide
Phospholipid