5ONM:
reference: Illuminating the catalytic core of ectoine synthase through structural and biochemical analysis., Czech L, Hoppner A, Kobus S, Seubert A, Riclea R, Dickschat JS, Heider J, Smits SHJ, Bremer E, Sci Rep. 2019 Jan 23;9(1):364. doi: 10.1038/s41598-018-36247-w. PMID: 30674920

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