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1D COSY corresponding to the benzylic methylene of a 1:1 mixture of 4f and the corresponding citrulline derivative 21b when overlapping aromatic signals at δ 8.70 are irradiated. Signals A, B, D and E correspond to 4f, whilst signal C belong to 21b. The broad signal at δ 4.70 is a solvent artefact.
