Prodrug-type anticancer agent using cancer-specific enzymatic activity

A compound represented by general formula (I) or a salt thereof,

• (wherein,
• X is selected from the group consisting of a fluorine atom, ester group (—OC(═O)—R′), carbonate group (—OCO2—R′), carbamate group (—OCONH—R′), phosphoric acid and ester groups thereof (—OP(═O)(—OR′)(—OR″), and sulfuric acid and ester groups thereof (—OSO2—OR′),
• where R′ and R″ are each independently selected from substituted or unsubstituted alkyl groups or substituted or unsubstituted aryl groups;
• Y is —NH—CO-L, —NH-L′, or —OL′,
• where L is a partial structure of an amino acid,
• L′ is a saccharide or a partial structure of a saccharide, a saccharide having a self-cleaving linker, an amino acid or a peptide having a self-cleaving linker;
• R1 and R2 are each independently selected from a hydrogen atom or a monovalent substituent;
• R3 represents a hydrogen atom or one to four monovalent substituents present on a benzene ring, which are the same or different).