isomer
One of several species (or
molecular entities
) that have the same atomic composition (
molecular formula
) but different
line formulae
or different
stereochemical formulae
and hence different physical and/or chemical properties.
Source:
PAC, 1994,
66
, 1077
(Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994))
on page 1129
PAC, 1996,
68
, 2193
(Basic terminology of stereochemistry (IUPAC Recommendations 1996))
on page 2210