Two forms of D-glucopyranose, are called_________.
Anomers are diastereoisomers of cyclic forms of sugars or similar molecules differing in the configuration at the anomeric carbon (C−1 atom of an aldose or the C−2 atom of a 2-ketose). The cyclic forms of carbohydrates can exist in two forms, α− and β− based on the position of the substituent at the anomeric centre.