4O9P:
reference: Structural biology. Division of labor in transhydrogenase by alternating proton translocation and hydride transfer., Leung JH, Schurig-Briccio LA, Yamaguchi M, Moeller A, Speir JA, Gennis RB, Stout CD, Science. 2015 Jan 9;347(6218):178-81. doi: 10.1126/science.1260451. PMID: 25574024

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