S 1 Supporting Information Oxo-Ester Mediated Native Chemical Ligation on Microarrays: An Efficient and Chemoselective Coupling Methodology Martin J. Weissenborn, a Roberto Castangia, a Johannes W. Wehner, b Robert Šardzík, a Thisbe K. Lindhorst* b and Sabine L. Flitsch* a a School of Chemistry & Manchester Interdisciplinary Biocentre, The University of Manchester, 131 Princess Street, Manchester, M17DN (UK). Fax: 44- 161-275-1311; Tel: -44- 161-306-5172; E-mail: sabine.flitsch@manchester.ac.uk b Otto Diels Institute of Organic Chemistry, Christiana Albertina University of Kiel, Otto-Hahn-Platz 3/4, 24098 Kiel, Germany. Fax: 49-431-880-7410; E-mail: tklind@oc.uni-kiel.de 1. General methods ........................................................................................ 2 2. Peptide synthesis ........................................................................................ 3 3. Saccharide synthesis .................................................................................. 4 4. Coupling on Self-Assembled Monolayers (SAMs) ................................. 17 5. MALDI-ToF MS spectra ......................................................................... 20 6. Surface Plasmon Resonance (SPR) Analysis .......................................... 38 Electronic Supplementary Material (ESI) for Chemical Communications This journal is © The Royal Society of Chemistry 2012