5H4S:
reference: Carbohydrate recognition by the rhamnose-binding lectin SUL-I with a novel three-domain structure isolated from the venom of globiferous pedicellariae of the flower sea urchin Toxopneustes pileolus., Hatakeyama T, Ichise A, Unno H, Goda S, Oda T, Tateno H, Hirabayashi J, Sakai H, Nakagawa H, Protein Sci. 2017 May 3. doi: 10.1002/pro.3185. PMID: 28470711

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