2O3S:
reference: Structural basis for formation and hydrolysis of the calcium messenger cyclic ADP-ribose by human CD38., Liu Q, Kriksunov IA, Graeff R, Lee HC, Hao Q, J Biol Chem. 2007 Feb 23;282(8):5853-61. Epub 2006 Dec 20. PMID: 17182614

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