3CKP:
reference: Synthesis, SAR, and X-ray structure of human BACE-1 inhibitors with cyclic urea derivatives., Park H, Min K, Kwak HS, Koo KD, Lim D, Seo SW, Choi JU, Platt B, Choi DY, Bioorg Med Chem Lett. 2008 May 1;18(9):2900-4. Epub 2008 Apr 8. PMID: 18434152

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