2WEB: Acid Proteinase (Penicillopepsin) (E.C.3.4.23.20) Complex Wi Phosphonate Inhibitor: Methyl(2s)-[1-(((N-Formyl)-L-Valyl)A Naphthyl)Ethyl)Hydroxyphosphinyloxy]-3-Phenylpropanoate, So

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