1DPM:
reference: Three-dimensional structure of the zinc-containing phosphotriesterase with the bound substrate analog diethyl 4-methylbenzylphosphonate., Vanhooke JL, Benning MM, Raushel FM, Holden HM, Biochemistry 1996 May 14;35(19):6020-5. PMID: 8634243

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