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1 The two forms are sometimes described as  anomers  since they are isomers at the anomeric center. 2  To assign the cyclic form of a carbohydrate as the Î±- or Î²- form look at the relative positions of the-CH 2 OH group and-OH (or-OR) group at the anomeric center. In the Î²- form, the exocyclic O group at the anomeric center is on the same face as the-CH 2 OH group. 2  If a mixture of the Î±- and Î²- anomers are present, then this is often represented by using a wavy line to represent the bond:
-glucose are generally used for these cyclic forms as well. The ring arises from the open-chain form by a nucleophilic addition reaction between the aldehyde group -(C=O)H at C-1 and the hydroxyl group-OH at C-4 or C-5, yielding a hemiacetal group-C(OH)H-O-.