2N71:
reference: NMR structure of CmPI-II, a non-classical Kazal protease inhibitor: Understanding its conformational dynamics and subtilisin A inhibition., Cabrera-Munoz A, Valiente PA, Rojas L, Alonso-Del-Rivero Antigua M, Pires JR, J Struct Biol. 2019 Jun 1;206(3):280-294. doi: 10.1016/j.jsb.2019.03.011. Epub, 2019 Mar 28. PMID: 30930219

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