5YCZ:
reference: Crystal structure of a novel Kunitz type inhibitor, Alocasin with Anti-Aedes aegypti activity targeting midgut proteases., Vajravijayan S, Pletnev S, Pletnev VZ, Nandhagopal N, Gunasekaran K, Pest Manag Sci. 2018 May 7. doi: 10.1002/ps.5063. PMID: 29737039

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