achiral

https://doi.org/10.1351/goldbook.A00069
See: chirality
Sources:
Blue Book, p. 479 (https://www.acdlabs.com/iupac/nomenclature/)
PAC, 1996, 68, 2193. 'Basic terminology of stereochemistry (IUPAC Recommendations 1996)' on page 2197 (https://doi.org/10.1351/pac199668122193)