6VCF:
reference: Structural basis for carotenoid cleavage by an archaeal carotenoid dioxygenase., Daruwalla A, Zhang J, Lee HJ, Khadka N, Farquhar ER, Shi W, von Lintig J, Kiser PD, Proc Natl Acad Sci U S A. 2020 Aug 3. pii: 2004116117. doi:, 10.1073/pnas.2004116117. PMID: 32747548

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