Tyrosine is usually a non-important phenylalanine-derived amino acid. Tyrosine’s construction is made a para-hydroxylated phenyl ring linked to a pentanoic acid team, which is a 5 member carbon chain with a carboxyl (C(=O)OH) group on the terminal carbon. This pentanoic acid chain is substituted at R2 using an amino team https://revivalschem.com/product/buy-2c-e-pellets-10-mg/