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Natural products such as polyketides often possess various spin systems, consisting of a methine group directly bonded to a methyl group (e.g., ─CHA─CHB(CH3)─CHC─). The methine proton HB splits into a broadened multiplet by coupling with several vicinal protons, rendering analysis difficult of nJH–H with respect to HB in double‐quantum filtered COSY or exclusive COSY. For the purpose of measuring...
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