One of several species (or @[email protected] ) that have the same atomic composition (@[email protected]) but different @[email protected] or different @[email protected] and hence different physical and/or chemical properties.
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1129 [Terms] [Paper]
PAC, 1996, 68, 2193. (Basic terminology of stereochemistry (IUPAC Recommendations 1996)) on page 2210 [Terms] [Paper]