Tyrosine is a non-important phenylalanine-derived amino acid. Tyrosine’s composition is manufactured a para-hydroxylated phenyl ring connected to a pentanoic acid team, which can be a 5 member carbon chain with a carboxyl (C(=O)OH) team to the terminal carbon. This pentanoic acid chain is substituted at R2 having an amino group https://revivalschem.com/product/buy-bk-2c-b-hydrochloride/