4F6L:
reference: Heterologous expression and structural characterisation of a pyrazinone natural product assembly line., Wyatt MA, Mok MC, Junop M, Magarvey NA, Chembiochem. 2012 Nov 5;13(16):2408-15. doi: 10.1002/cbic.201200340. Epub 2012, Oct 15. PMID: 23070851

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