epimers
Diastereoisomers
that have the opposite
configuration
at only one of two or more tetrahedral
stereogenic
centres present in the respective molecular entities.
Source:
PAC, 1996,
68
, 2193
(Basic terminology of stereochemistry (IUPAC Recommendations 1996))
on page 2208
PAC, 1994,
66
, 1077
(Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994))
on page 1113