stereoheterotopic

https://doi.org/10.1351/goldbook.S05981
Either @[email protected] or @[email protected] (In contrast the term constitutionally @[email protected] has been used to describe identical groups located in constitutionally non-equivalent positions).
See also:
pro-R, pro-S
Source:
PAC, 1996, 68, 2193. (Basic terminology of stereochemistry (IUPAC Recommendations 1996)) on page 2219 [Terms] [Paper]