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(a) Spin topology of the Type‐1 agent 1, showing the J‐couplings that exist between the 1H and 13C nuclei, in which R1=deuterated phenyl group; (b) corresponding 13C NMR spectrum of agent 1 in [D4]MeOH; (c) M2S‐S2M pulse sequence used here; (d) spin topology of Type‐2 substrate 5 and corresponding 13C NMR spectrum in [D4]MeOH (e).
