SUPPORTING INFORMATION Total synthesis of Noricumazole B establishes D-arabinose as glycon unit

H and C NMR spectra were recorded with Bruker DPX-400, AVANCE-400 and DRX-500. The numbering of the protons relate to the numbering chosen in Fig. 1. High resolution mass spectra were obtained with a Micromass LCT via loop-mode injection from a Waters (Alliance 2695) HPLC system. Alternatively a Micromass Q-TOF in combination with a Waters Aquity Ultraperformance LC system was employed. Ionization was achieved by ESI or APCI. Modes of ionization, calculated and found mass are given. RP-HPLC was performed on RP-CN with CH3CN/H2O gradient eluation. CD spectra were obtained using a Jasco J-810 circular dichroism spectropolarimeter. Analytical thin-layer chromatography was performed using precoated silica gel 60 F254 plates (Merck, Darmstadt). Flash column chromatography was performed on Merck silica gel (230-400 mesh). Unless otherwise noted, all reactions were carried out under an atmosphere of nitrogen in dry glassware. Commercially available reagents and dry solvents were used as received.