Epimer
When two isomers differ at one chiral centre. For example, when two monosaccharide carbohydrates have a different conformation of the H and OH on one of their asymmetric carbons (other than carbon 5) they are epimers. The sugars D- β-Glucose and D- β-Mannose are epimers at carbon 2 (they have different conformations at carbon 2) but the rest of their carbons are in the same conformation. [1]
- ↑ Stryer. L, Tymoczko. J, Berg. J. (2012) Biochemistry, 7th Edition, W.H. Freeman and Company, USA, p.331