In sugar chemistry, the anomer that places the hemiacetal (or hemiketal) hydroxy group on the side of the pyranose (or furanose) ring opposite the non-ring carbon atom (i.e. C-6 of glucose) that is attached to the carbon whose configuration defines the sugar as having a D- or L-configuration, i.e. C-5 of glucose; thus the mirror image of a-D-glucose is a-L-glucose. For example, for the pyranose form of a-D-glucose, the C-1 hydroxy group is on the opposite side of the ring from C-6.