Selective photodeuteration of carboxyltryptamines at C‐4 allowed to settle the controversy about the 13 C nmr assignment of C‐4, C‐5 and C‐6, which for tryptophan are definitively assigned at 118.4, 118.2 and 120.6 ppm, respectively.
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Morales‐Ríos et al. (1986) studied this question.
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