6TV4:
reference: Caffeine inhibits Notum activity by binding at the catalytic pocket., Zhao Y, Ren J, Hillier J, Lu W, Jones EY, Commun Biol. 2020 Oct 8;3(1):555. doi: 10.1038/s42003-020-01286-5. PMID: 33033363

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