1HX2:
reference: Solution structure of BSTI: a new trypsin inhibitor from skin secretions of Bombina bombina., Rosengren KJ, Daly NL, Scanlon MJ, Craik DJ, Biochemistry 2001 Apr 17;40(15):4601-9. PMID: 11294627

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