| abstract |
[PROBLEMS] To provide a dye which can fluorescently stain a tumor cell or tissue in a selective manner. [MEANS FOR SOLVING PROBLEMS] A fluorescent dye selective to a tumor cell or tissue, which comprises a compound represented by the general formula (I): (I) wherein R1 and R2 independently represent a C1-C4 alkyl group which may have a substituent, a C2-C4 alkenyl group which may have a substituent, a C2-C4 alkynyl group which may have a substituent, an aryl group which may have a substituent or a heteroaryl group which may have a substituent. |