3H5Y:
reference: Binding of 2'-amino-2'-deoxycytidine-5'-triphosphate to norovirus polymerase induces rearrangement of the active site., Zamyatkin DF, Parra F, Machin A, Grochulski P, Ng KK, J Mol Biol. 2009 Jul 3;390(1):10-6. Epub 2009 May 5. PMID: 19426741

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