C-N = Peptide Bond

C - ( OH    H ) - N   

C-N    +    >> H₂O

NCC - OH      H - NCC    >> H₂O

NCC - NCC - NCC - NCC    >> 3 H₂O

       H
-⁺N-C-C^--
       R

It is easy. See water removed to join C- and -N   C-N   >> water out.
Nitrogen side looses one hydrogen, all adds up.
How amino acids are linked together to make proteins.

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