1RKP: Crystal Structure Of Pde5a1-Ibmx
reference: Crystal structures of phosphodiesterases 4 and 5 in complex with inhibitor IBMX suggest a conformation determinant of inhibitor selectivity., Huai Q, Liu Y, Francis SH, Corbin JD, Ke H, J Biol Chem 2003 Dec 10;. PMID: 14668322

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