PROBLEM TO BE SOLVED: To provide a novel near infrared dye-binding transferrin that shows a high absorption coefficient in a near-infrared wavelength range, high tumor accumulation, a high tumor blood ratio, and high imaging contrast, and a contrast medium for photoacoustic imaging comprising the same.SOLUTION: The present invention provides a compound in which transferrin and an organic dye that absorbs light in a near-infrared wavelength range are covalently bound.SELECTED DRAWING: NoneCOPYRIGHT: (C)2017,JPO&INPIT【課題】高い近赤外波長領域の吸収係数、高い腫瘍集積性、高い腫瘍血中比、ならびに高いイメージングコントラストを示す新規な近赤外色素結合トランスフェリン、ならびにそれを含む光音響イメージング用造影剤を提供すること。【解決手段】トランスフェリンと、近赤外波長領域の光を吸収する有機色素と、が共有結合した化合物。【選択図】なし
