2KNI:
reference: A dynamic pharmacophore drives the interaction between Psalmotoxin-1 and the putative drug target acid-sensing ion channel 1a., Saez NJ, Mobli M, Bieri M, Chassagnon IR, Malde AK, Gamsjaeger R, Mark AE, Gooley PR, Rash LD, King GF, Mol Pharmacol. 2011 Nov;80(5):796-808. doi: 10.1124/mol.111.072207. Epub 2011 Aug, 8. PMID: 21825095

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