6B9T:
reference: Structural basis for methylphosphonate biosynthesis., Born DA, Ulrich EC, Ju KS, Peck SC, van der Donk WA, Drennan CL, Science. 2017 Dec 8;358(6368):1336-1339. doi: 10.1126/science.aao3435. PMID: 29217579

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