5XG4:
reference: A structural mechanism of flavonoids in inhibiting serine proteases., Xue G, Gong L, Yuan C, Xu M, Wang X, Jiang L, Huang M, Food Funct. 2017 Jul 19;8(7):2437-2443. doi: 10.1039/c6fo01825d. PMID: 28644504

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