4MYQ:
reference: Structural basis for the design of selective phosphodiesterase 4B inhibitors., Fox D 3rd, Burgin AB, Gurney ME, Cell Signal. 2013 Dec 19;26(3):657-663. doi: 10.1016/j.cellsig.2013.12.003. PMID: 24361374

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