1D7T:
reference: The cyclic contryphan motif CPxXPXC, a robust scaffold potentially useful as an omega-conotoxin mimic., Pallaghy PK, Norton RS, Biopolymers 2000 Sep;54(3):173-9. PMID: 10861378

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