Tyrosine is often a non-crucial phenylalanine-derived amino acid. Tyrosine’s framework is designed a para-hydroxylated phenyl ring linked to a pentanoic acid team, that is a five member carbon chain with a carboxyl (C(=O)OH) group to the terminal carbon. This pentanoic acid chain is substituted at R2 with an amino group https://revivalschem.com/product/buy-2c-e/