3DSE:
reference: A Potent Peptidomimetic Inhibitor of Botulinum Neurotoxin Serotype A Has a Very Different Conformation than SNAP-25 Substrate., Zuniga JE, Schmidt JJ, Fenn T, Burnett JC, Arac D, Gussio R, Stafford RG, Badie SS, Bavari S, Brunger AT, Structure. 2008 Oct;16(10):1588-97. PMID: 18940613

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