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Fig. 9.
13CO2 ‘crossover’ labelling experiments (and their associated spectra) carried out with 4-Ag and 4-Ag-13C: (a) addition of 13CO2 to 4-Ag to yield 6-Ag-13C and CO; (b) addition of unlabelled CO2 to 4-Ag-13C to yield 6-Ag and 13CO.