CELL-PERMEABLE NEW FLUORESCENT PIGMENT

PROBLEM TO BE SOLVED: To provide a method of synthesizing a new fluorescent pigment molecule, a purification method, and an application as a skeleton of a cell introduction type probe. SOLUTION: A compound represented by formula (I) (wherein R1is hydrogen, carbonyl, an alkylcarbonyl or an alkyl ester; R2is absent or is an alkyl, an alkylphenyl, an alkylcarbonyl or an alkylamide; R3is hydrogen, an alkyl, carbonyl, an alkylcarbonyl or an alkylamide; X1and X2are independently selected from the group consisting of an alkyl, an arylalkyl, a cycloalkyl, a heterocycloalkyl, a heteroarylalkyl, an aryl and a heteroaryl (which are substituted or nonsubstituted); n is 0, 1, 2 or 3; and m is 0, 1 or 2), a derivative thereof or a salt of these compounds are described. COPYRIGHT: (C)2010,JPO&INPIT