Tyrosine is actually a non-essential phenylalanine-derived amino acid. Tyrosine’s structure is manufactured a para-hydroxylated phenyl ring connected to a pentanoic acid group, that's a five member carbon chain that has a carboxyl (C(=O)OH) team about the terminal carbon. This pentanoic acid chain is substituted at R2 using an amino group https://revivalschem.com/product/buy-1v-lsd-valerie-225mcg/