1MAG:
reference: Macromolecular structural elucidation with solid-state NMR-derived orientational constraints., Ketchem RR, Lee KC, Huo S, Cross TA, J Biomol NMR 1996 Jul;8(1):1-14. PMID: 8810522

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