tetrapeptide has -COOH group| Chemistry | JEE Advanced 2013

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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 $-\mathrm{NH}_2$ group attached to a chiral center is :

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