. . . . . . . . "catecholamine"@en . . . . . . . . "catecholamine"@en . . . . . . . . . . . . . . "catecholamines"@en . . . "4-(2-aminoethyl)pyrocatechol and derivatives formed by substitution"@en . . . . . . . . . . . . . "catecholamine"@en . .