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emi12268-sup-0001-fs1.tif372K

Fig. S1. Base peak region of the ESI mass spectrum of the isolated cobamide (spectrum A) and calculated mass spectra of norvitamin B12 (spectrum B), vitamin B12 (spectrum C) and norpseudovitamin B12 (spectrum D). The spectra were simulated for the protonated molecular ion [M + H]+ and the sodium adduct [M + Na]+ respectively.

emi12268-sup-0002-fs2.tif2347K

Fig. S2. Section of the 500 MHz 1H-NMR spectra (D2O, 25°C) of synthetic norvitamin B12 (spectrum A, blue) and of the isolated cobamide (spectrum B, red). The signals of the four H-atoms attached at the ethanolamine linker are highlighted with arrows. (X indicates residual solvent signals)

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