6HCP:
reference: Preacinetobactin not acinetobactin is essential for iron uptake by the BauA transporter of the pathogen Acinetobacter baumannii., Moynie L, Serra I, Scorciapino MA, Oueis E, Page MG, Ceccarelli M, Naismith JH, Elife. 2018 Dec 18;7. pii: 42270. doi: 10.7554/eLife.42270. PMID: 30558715

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