Convert the carboxylic acid groups of methionine and serine into more reactive species. This can be done using reagents like DCC (dicyclohexylcarbodiimide) or EDC (ethyl-3-(3-dimethylaminopropyl)carbodiimide).
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(S)-N-Boc-2-(3'-butenyl)glycine
N2,N2'-(Pyridine-2,6-dicarbonyl)di(S)phenylalaninehydrazide
