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Schematic representation of the effect of labeling on the parent [Fe(Cys)(CN)]− peak in the ESI-MS of syn-B and its analogs. Incorporation of 13CN causes a shift of 1 m/z, the isotopologue containing 13C3,15N-cysteinate results in a shift of 4 m/z, and incorporation of selenocysteine (80Se) causes a shift of 48 m/z.
