4IWN:
reference: S-Adenosyl-S-carboxymethyl-L-homocysteine: a novel cofactor found in the putative tRNA-modifying enzyme CmoA., Byrne RT, Whelan F, Aller P, Bird LE, Dowle A, Lobley CM, Reddivari Y, Nettleship JE, Owens RJ, Antson AA, Waterman DG, Acta Crystallogr D Biol Crystallogr. 2013 Jun;69(Pt 6):1090-8. doi:, 10.1107/S0907444913004939. Epub 2013 May 15. PMID: 23695253

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).