Problem: In conventional peptide synthesis, the nitrogen of a given amino acid must be deactivated or blocked while the carboxyl group Is activated. Which of the following reagents Is used to protect the amino group of an amino acid? A. di-tert-butyl bicarbonate B. dicyclohexylcarbodiimide C. ninhydrin D. trifluoroacetic acid E. phenylisothiocyanate

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In conventional peptide synthesis, the nitrogen of a given amino acid must be deactivated or blocked while the carboxyl group Is activated. Which of the following reagents Is used to protect the amino group of an amino acid? 

A. di-tert-butyl bicarbonate 

B. dicyclohexylcarbodiimide 

C. ninhydrin 

D. trifluoroacetic acid 

E. phenylisothiocyanate

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