4Z1W:
reference: Removal of Chromophore-Proximal Polar Atoms Decreases Water Content and Increases Fluorescence in a Near Infrared Phytofluor., Lehtivuori H, Bhattacharya S, Angenent-Mari NM, Satyshur KA, Forest KT, Front Mol Biosci. 2015 Nov 25;2:65. doi: 10.3389/fmolb.2015.00065. eCollection, 2015. PMID: 26636092

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