gauche

https://doi.org/10.1351/goldbook.G02593
Synonymous with a @T06406-1@ alignment of groups attached to adjacent atoms.
See:
torsion angle
Sources:
Blue Book, p. 484 [Terms] [Book]
PAC, 1996, 68, 2193. (Basic terminology of stereochemistry (IUPAC Recommendations 1996)) on page 2209 [Terms] [Paper]