1SOM: Torpedo Californica Acetylcholinesterase Inhibited By Nerve (Soman).
reference: Crystal structures of aged phosphonylated acetylcholinesterase: nerve agent reaction products at the atomic level., Millard CB, Kryger G, Ordentlich A, Greenblatt HM, Harel M, Raves ML, Segall Y, Barak D, Shafferman A, Silman I, Sussman JL, Biochemistry 1999 Jun 1;38(22):7032-9. PMID: 10353814

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