Linked Diequatorial Pyranosides

Lacto-A-triose II GlcNAcp-(l - 3)-d-Gal P-d-G1cN Ncp- 1 - 3)-P-d- Milk oligosaccharide 

Melibiose a-D-Gal/)-( 1 - 6)-d-G1c stereo- and regioisomers also called mannobiose, etc. 

Sucrose Galp-( 1 - 6)-a-D-Glcp-(1 2)-P-D-Fm/ a-D-Glc/)-(l - 2)-P-d- Common sugar. Non-reducing 

4-Diequatorially linked polypyranose structures form fibres when the polysaccharides are undecorated - indeed, oligosaccharides beyond a degree of polymerisation of 6 become almost water insoluble. When, however, the backbone chain is substituted ( decorated ), as it is in the plant hemicelluloses, the decoration interferes with the parallel packing of the chains and much more soluble polymers result. 

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