Constitutionally different yet closely related chemical species MX and MY having the
opposite
chirality sense of the large common
chiralmoiety M. For example (
R)-2-bromobutane is a quasi-
enantiomer of (
S)-2-chlorobutane.
Source:
PAC, 1996, 68, 2193
(Basic terminology of stereochemistry (IUPAC Recommendations 1996))
on page 2215