2CDX:
reference: Structure of cobra cardiotoxin CTX I as derived from nuclear magnetic resonance spectroscopy and distance geometry calculations., Jahnke W, Mierke DF, Beress L, Kessler H, J Mol Biol 1994 Jul 29;240(5):445-58. PMID: 8046750

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