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Peptide nitrosation in dilute acid.

Rates and products are reported for the nitrosation of simple dipeptides (glycylglycine, its ethyl ester and N-acetylglycylglycine) in dilute acid at 37 degrees C. The results suggest that conversion to a diazo derivative (which rapidly decomposes) is the most likely outcome of the gastric nitrosation of small proteins and peptides.