[Synthesis of an insulin-like growth factor I hybrid insulin (author's transl)].

Stepwise Edman degradation of the insulin B chain is achieved after reversible protection of the amino groups in A1 and B29 with the acid-stable methylsulfonylethyloxycarbonyl residue. Condensation of the protected N-terminal tetrapeptide of insulin-like growth factor I with the degraded insulin yields an hybrid insulin whose synthesis and biological properties are discussed.