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FRIEDMAN AM, CHERONIS J, ZALUTSKY M, COOPER M, HOFFMAN P, HELLER A, ISRAELSTAM D, HARPER P, HILL T, TONG R, HUANG CC, NORENE T. PREPARATION OF BR-77 AND BR-76 L-DOPA AND 5-HYDROXYTRYPTOPHAN ANALOGS. JOURNAL OF LABELLED COMPOUNDS & RADIOPHARMACEUTICALS. 1979. p. 66–67.