"L-DOPA (/\u02CC\u025Bl\u02C8do\u028Ap\u0259/ or /\u02CCl\u025Bvo\u028A\u02C8do\u028Ap\u0259/) (alt., L-3,4-dihydroxyphenylalanine) is a chemical that is made and used as part of the normal biology of humans, some animals and plants. Some animals and humans make it via biosynthesis from the amino acid L-tyrosine. L-DOPA is the precursor to the neurotransmitters dopamine, norepinephrine (noradrenaline), and epinephrine (adrenaline) collectively known as catecholamines."@en . . "30.0"^^ . .