ξ- (xi-)
Copy
https://doi.org/10.1351/goldbook.X06693
A symbol used to denote unknown configuration at a chiral centre.
Source:
PAC, 1984,
56
, 595. 'Nomenclature and Symbolism for Amino Acids and Peptides' on page 601 (https://doi.org/10.1351/pac198456050595)