4R9H:
reference: A covalent homodimer probing early oligomers along amyloid aggregation., Halabelian L, Relini A, Barbiroli A, Penco A, Bolognesi M, Ricagno S, Sci Rep. 2015 Sep 30;5:14651. doi: 10.1038/srep14651. PMID: 26420657

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