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The downfield shift of the tyrosyl proton resonances and an increased chemical shift difference between the resonances for the 2',6' and 3',5' hydrogens in a series of deamino-oxytocin analogs modified in the disulfide bridge provide evidence for aromatic-sulfur interactions in d6-dimethylsulfoxide solutions.
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Lebl et al. (1987) studied this question.
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