6CUT:
reference: Engineered biosynthesis of beta-alkyl tryptophan analogs., Boville CE, Scheele RA, Koch P, Brinkmann-Chen S, Buller AR, Arnold FH, Angew Chem Int Ed Engl. 2018 Sep 14. doi: 10.1002/anie.201807998. PMID: 30215880

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