Enoxaparin sodium consists of a complex set of oligosaccharides that have not yet been fully characterized. Most of the components have a 4-chenuronic acid structure at the non-reducing end of their chains. About 20% of the materials containing Chemicalbook have 1, 6-dehydrated derivatives at the reduced end of the chain, ranging between 15% and 25%. The weight average molecular weight of sodium Enox-aparin is 4500Da and ranges from 3800 to 5000Da.