In photodynamic therapy for new sugar linked photosensitizer

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PROBLEM TO BE SOLVED : To provide a chlorin derivative that is a photosensitive material for photodynamic therapy and has antitumor activity and a metal complex thereof.SOLUTION : This invention provides a chlorin derivative represented by the general formula (I) or a metal complex thereof, wherein R-Rare different or the same and represent F-, mannose-S- or the like; Rand Rare different or the same and represent a hydrogen atom, alkyl or E-(CH)-, where E represents aryl, amino, alkylamino, imino or the like and n represents an integer of 0-3.