Tyrosine and phenylalanine function metabolic precursors in direction of the synthesis of mescaline. Tyrosine can either undergo a decarboxylation by way of tyrosine decarboxylase to make tyramine and subsequently endure an oxidation at carbon 3 by a monophenol hydroxylase or to start with be hydroxylated by tyrosine hydroxylase to sort L-DOPA and