5NXB:
reference: The mechanism of glycosphingolipid degradation revealed by a GALC-SapA complex structure., Hill CH, Cook GM, Spratley SJ, Fawke S, Graham SC, Deane JE, Nat Commun. 2018 Jan 11;9(1):151. doi: 10.1038/s41467-017-02361-y. PMID: 29323104

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