2EZA:
reference: Defining long range order in NMR structure determination from the dependence of heteronuclear relaxation times on rotational diffusion anisotropy., Tjandra N, Garrett DS, Gronenborn AM, Bax A, Clore GM, Nat Struct Biol 1997 Jun;4(6):443-9. PMID: 9187651

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