Identification of Amino Acid with Benzyl Side Chain

Amino acids are the building blocks of proteins and play a critical role in various biochemical processes within living organisms. Among the 20 standard amino acids, some possess unique properties that influence protein structure and function. Consider an amino acid that contains a benzyl side chain, which gives it a distinctive hydrophobic character and contributes to the stabilization of protein structures through hydrophobic interactions.

Which of the following amino acids is characterized by a benzyl side chain?