. "The chemical reactions and pathways involving phenylethylamine, an amine with pharmacological properties similar to those of amphetamine, occurs naturally as a neurotransmitter in the brain, and is present in chocolate and oil of bitter almonds." . . . . "phenylethylamine metabolic process" . "phenylethylamine metabolism" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .