https://doi.org/10.1351/goldbook.S06078
A @[email protected] or @[email protected], in which one atom or group in a @[email protected] is replaced by another atom or group. For example,
S06078-1.png
Source:
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1169 [Terms] [Paper]