| abstract |
(57) Abstract: An amino acid or peptide containing at least one 13C or 14C or a pharmaceutically acceptable salt thereof (excluding Bz-Tyr- 13C -PABA). ) Provided is a diagnostic agent for pancreatic exocrine function. The present invention also provides a 13 C- or 14 C-labeled compound represented by the following formula (II) or a salt thereof. X 2 —R 2 —Y 2 —Z 1 (II) (wherein X 2 is a hydrogen atom or a protecting group, and R 2 is A peptide having 2 to 5 amino acids, an amino acid or a single bond, Y 2 is an amino acid, Z 1 is an amino acid which may have a protecting group, and the amino acids in R 2 , Y 2 and Z 1; When X 2 and Z 1 are carbon-containing protecting groups, at least one of the protecting groups is 13 C- or 14 C-labeled. [Effect] According to the present invention, a highly sensitive pancreatic exocrine function test capable of reducing the burden on the subject and obtaining the results immediately and accurately has become possible. |