6OPJ:
reference: Covalent and noncovalent constraints yield a figure eight-like conformation of a peptide inhibiting the menin-MLL interaction., Fortuna P, Linhares BM, Purohit T, Pollock J, Cierpicki T, Grembecka J, Berlicki L, Eur J Med Chem. 2020 Aug 20;207:112748. doi: 10.1016/j.ejmech.2020.112748. PMID: 32882610

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