stereodescriptor
A prefix to specify
configuration
(absolute or relative) or
conformation
. For example
R
,
S
;
r
,
s
;
P
,
M
;
Re
,
Si
;
E
,
Z
;
ap
,
sp
; etc.
Source:
PAC, 1996,
68
, 2193
(Basic terminology of stereochemistry (IUPAC Recommendations 1996))
on page 2218