1QFB:
reference: Solution structure of contryphan-R, a naturally occurring disulfide-bridged octapeptide containing D-tryptophan: comparison with protein loops., Pallaghy PK, Melnikova AP, Jimenez EC, Olivera BM, Norton RS, Biochemistry 1999 Aug 31;38(35):11553-9. PMID: 10471307

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