syn

  1. See: torsion angle
  2. See: endo, exo, syn, anti
  3. See: anti
  4. Formerly used to describe the stereochemistry of oximes and related systems.
    See: E,Z
Source:
PAC, 1996, 68, 2193 (Basic terminology of stereochemistry (IUPAC Recommendations 1996)) on page 2220