5J6D:
reference: Discovery of acyl guanidine tryptophan hydroxylase-1 inhibitors., Goldberg DR, De Lombaert S, Aiello R, Bourassa P, Barucci N, Zhang Q, Paralkar V, Stein AJ, Valentine J, Zavadoski W, Bioorg Med Chem Lett. 2016 Jun 15;26(12):2855-60. doi:, 10.1016/j.bmcl.2016.04.057. Epub 2016 Apr 21. PMID: 27146606

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