3-(4-Hydroxyphenyl)-D-alanine, also known as Dopa, is a naturally occurring amino acid. It plays a crucial role in the biosynthesis of catecholamine neurotransmitters such as dopamine, norepinephrine, and epinephrine. Additionally, it serves as a precursor for melanin, a pigment responsible for skin and hair coloration. Due to its biological significance, 3-(4-Hydroxyphenyl)-D-alanine has garnered attention from researchers studying neurological disorders, pigmentation, and other related fields.