Anthraquinone and its derivatives

摘要

There is disclosed a compound of formula (I) wherein each of X₁ and X₂ are independently NH-A-NR¹R², and wherein A is A C_2-8 alkylene and R¹ and R² are independently selected from hydrogen, C_1-4 alkyl, C_2-4 hydroxy-alkyl and C_2-4 aminoalkyl, or R¹ and R² together form a C_2-6 alkylene group which with the nitrogen atom to which R¹ and R² are attached forms a heterocyclic ring, or an N-oxide derivative thereof, and wherein the compound (I) or its N-oxide derivative is optionally in the form of an acid salt derived from an organic or inorganic acid. Also disclosed is a method of its production and its uses, including its use in analyzing a cell or biological material and detecting the emitted fluorescence signal.