Tyrosylated proinsulin C-peptide derivatives

摘要

The disclosed peptide derivative of the formula: Y-Tyr-Gly-R Wherein, Y represents a hydrogen atom or an amino protecting group, Tyr represents a tyrosine residue wherein at least one of the hydrogen atoms on the phenyl ring may be substituted by a radioactive iodine, Gly represents a glycine residue, and R represents a peptide residue corresponding to an amino acid sequence which includes at least positions 7 through 21 of human proinsulin C-peptide proves to be useful for determining C-peptide level in human serum.