epimers

https://doi.org/10.1351/goldbook.E02167
@D01679@ that have the opposite @C01249@ at only one of two or more tetrahedral @S05980@ centres present in the respective molecular entities.
Sources:
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1113 [Terms] [Paper]
PAC, 1996, 68, 2193. (Basic terminology of stereochemistry (IUPAC Recommendations 1996)) on page 2208 [Terms] [Paper]