Tyrosine is actually a non-crucial phenylalanine-derived amino acid. Tyrosine’s structure is designed a para-hydroxylated phenyl ring connected to a pentanoic acid group, that is a five member carbon chain with a carboxyl (C(=O)OH) group over the terminal carbon. This pentanoic acid chain is substituted at R2 with an amino team https://revivalschem.com/product/buy-2c-e-pellets-10-mg/