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4‐(N‐benzoyl‐L‐tyrosyl) aminobenzoic acid, a diagnostic agent for a pancreatic exocrine function test, was labelled with carbon‐14. The synthetic procedure of 4‐(N‐benzoyl‐L‐tyrosyl)‐aminobenzoic[carboxy‐ 14 C] acid (I) and 4‐(N‐benzoyl [carbonyl‐ 14 C]‐L‐tyrosyl)aminobenzoic acid (II) is described.  The overall radiochemical yields for (I) and (II) were 75.4% and 22.5%, respectively.