5HCD:
reference: Structural basis for therapeutic inhibition of complement C5., Jore MM, Johnson S, Sheppard D, Barber NM, Li YI, Nunn MA, Elmlund H, Lea SM, Nat Struct Mol Biol. 2016 May;23(5):378-86. doi: 10.1038/nsmb.3196. Epub 2016 Mar, 28. PMID: 27018802

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