1H1D:
reference: Kinetics and crystal structure of catechol-o-methyltransferase complex with co-substrate and a novel inhibitor with potential therapeutic application., Bonifacio MJ, Archer M, Rodrigues ML, Matias PM, Learmonth DA, Carrondo MA, Soares-Da-Silva P, Mol Pharmacol. 2002 Oct;62(4):795-805. PMID: 12237326

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