Patent ID: 7060427

Claim:
A fluorescent complex comprising a nucleic acid and a N-oxide derivative of a compound of the following formula: wherein each of X 1 and X 2 are independently NH—A—NR 1 R 2 , and wherein A is a C 2-8 alkylene group and R 1 and R 2 are independently selected from hydrogen, C 1-4 alkyl, C 2-4 hydroxyalkyl and C 2-4 aminoalkyl, or R 1 and R 2 together form a C 2-6 alkylene group which with the nitrogen atom to which R 1 and R 2 are attached forms a heterocyclic ring, and wherein the N-oxide derivative of compound (I) is optionally in the form of an acid salt derived from an organic or inorganic acid.