phenylalanine molecule, structural chemical formula, ball-and-stick model, image alpha-amino acid

phenylalanine alphaamino acid proteinogenic amino acids glucogenic ketogenic dopamine agonists monoamine precursors molecule molecular structure chemical formula isolated model c9h11no2 atom chemistry science protein compound illustration structural symbol biology biochemistry element icon nitrogen food composition education hydrogen metabolism supplement aromatic sign flat carbon medical oxygen ball- -stick image alpha-amino