A tetrapeptide has $- COOH$ group on alanine. This produces glycine $(Gly)$, valine $(Val)$, phenyl alanine $(Phe)$ and alanine $(Ala)$, on complete hydrolysis. For this tetrapeptide, the number of possible sequences (primary structures) with $- NH _2$ group attached to a chiral center is:
IIT 2013, Medium
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