4RNS:
reference: Structures of the Inducer-Binding Domain of Pentachlorophenol-Degrading Gene Regulator PcpR from Sphingobium chlorophenolicum., Hayes RP, Moural TW, Lewis KM, Onofrei D, Xun L, Kang C, Int J Mol Sci. 2014 Nov 12;15(11):20736-52. doi: 10.3390/ijms151120736. PMID: 25397598

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