A hexapeptide has composition `"Ala-Gly-Phe-Val"_(3)`. Both N - teriminal & C - terminal units are val. The number of val - val peptide bonds present, half of total `1^(@)` - structures hexapeptide passible which satidfy these conditions are ________.

Answer

6

Explanation

By writing the possible structures of peptides by applying the given conditions we can count.