Provided is an enzyme-specific fluorescent compound capable of being retained in cells, which can emit fluorescence specifically in a target cell, particularly a cell capable of expressing a reporter enzyme such as β-galactosidase, and can covalently bind to a protein in the cell to exhibit an excellent property of being retained in the cell. The fluorescent compound comprises a compound represented by formula (I′) or a salt thereof. In formula (I′), A, X, Y and R1 to R9 are as described in claim 1.
提供了一种酶特异性荧光化合物,能够在细胞内保留,并能在靶细胞中特异性地发出荧光,特别是在能够表达报告酶如
β-半乳糖苷酶的细胞中,并能共价结合到细胞中的蛋白质中,表现出优异的保留在细胞中的特性。该荧光化合物包括由公式(I')或其盐所表示的化合物。在公式(I')中,A、X、Y和R1至R9如权利要求1所述。