Protein structures are classified based on recurring structural motifs, which are common arrangements of secondary structures like α-helices and β-sheets. Motifs are crucial for determining protein function and interactions.
In the given pentapeptide, find out an essential amino acid (\(Y\)) and the sequence present in the pentapeptide. 
Choose the correct answer from the options given below:
Given below are two statements for the following reaction sequence: 
Match List-I with List-II. 