A method for producing a compound represented by formula (C), the method comprising a step for converting a compound represented by formula (B) (wherein R1 represents an amino group protected by a protecting group) by intramolecular cyclization into a compound represented by formula (C) (wherein R1 is defined as above).一種式(C)所表示的化合物之製造方法,其包含藉由將式(B)所表示的化合物(其中,R1係表示經保護基保護的胺基)進行分子內環化,而變換為式(C)所表示的化合物(其中,R1係表示與前述同意義)的步驟。