PROBLEM TO BE SOLVED: To provide improved compositions for photodynamic therapy (PDT) for the selective destruction of malignant, diseased, or infected cells or infective agents without causing damage to normal cells.SOLUTION: This invention relates to: a compound expressed by formula (I)； conjugates with carrier molecules of the compound； and a method for use in the treatment of disease (when b represents a double bond, D represents -CH2- or Q, Ra and Rb are both not present； when b represents a single bond, D represents -C(O)-, -CH2- or Q, Ra and Rb are either both H or both -OH； when R1 represents H or a moiety containing a functional group, R2 represents H or a solubilizing group； when R1 represents H or a solubilizing group, R2 represents H or a moiety containing a reactive group； G represents O or a direct bond； Q represents a PEG-containing fragment).COPYRIGHT: (C)2015,JPO&INPIT【課題】正常細胞に損傷を引き起こすことなく、悪性細胞、疾患細胞若しくは感染細胞又は感染体を選択的に破壊するための、改善された光線力学療法(photodynamic therapy)(PDT)用組成物の提供。【解決手段】式(I)で表される化合物。該化合物の担体分子との複合体、並びに疾患の治療における使用方法。(bが二重結合を表す場合、Dは-CH2-又はQ、Ra及びRbは双方とも存在せず；bが単結合を表す場合、Dは-C(O)-、-CH2-又はQ、Ra及びRbは双方ともH、又は双方とも-OH；R1が、H、反応性基を含有する部分を表す場合、R2はH又は可溶化基；R1がH又は可溶化基を表す場合、R2はH又は反応性基を含有する部分；GはO又は直接結合；Qは、含ＰＥＧフラグメント)【選択図】なし
