<p>METHOD FOR PRODUCING PEPTIDEThe mresent invention provides a method for producing a peptide, characterized in that it comprises converting an -SR group of a peptide comprising an amino acid residue having the -SH group to an -OH group, wherein said method comprises the following steps (a) to (c): (a) allowing an -SH group in a peptide to react with a methylating agent to convert the -SH group to angroup; (b) allowing the -SMe group obtained in the step(a) to react with a cyaning agent to prodmce a reaction intermediate; and (c) converting the reaction intermediate obtained in the step (b) to a peptide comprising an amino acid residue having an -0H group under more basic conditions than the conditions in the step: (b) .No figure</p>
