For details see: Sandercock, A.M., Charles, E.H., Scaife, W., Kirkpatrick, P.N., O'Brien, S.W., Papageorgiou, E.A., Spencer, J.B. and Williams, D.H. Biosynthesis of the di-meta-hydroxyphenylglycine constituent of the vancomycin-group antibiotic chloroeremomycin. Chem. Comm. (2001) 1252-1253.