3G2O:
reference: Structure and function of the glycopeptide N-methyltransferase MtfA, a tool for the biosynthesis of modified glycopeptide antibiotics., Shi R, Lamb SS, Zakeri B, Proteau A, Cui Q, Sulea T, Matte A, Wright GD, Cygler M, Chem Biol. 2009 Apr 24;16(4):401-10. PMID: 19389626

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