Angiotensin-II analogues. I: Synthesis and incorporation of the halogenated amino acids 3-(4'-iodophenyl)alanine, 3-(3',5'-dibromo-4'-chlorophenyl)alanine, 3-(3',4',5'-tribromophenyl)alanine, and 3-(2',3',4',5',6'-pentabromophenyl)alanine

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