Patent ID: RE39324

Claim:
A compound having the structure (1): and tautomers, solvates and salts thereof, wherein R 1 is an oligonucleotide, a protecting group, a linker or —H; R 2 is A(Z) X1 , wherein A is a spacer and Z independently is a label bonding group optionally bonded to a detectable label, but R 2 is not amine NH 2 , protected amine NH 2 , nitro or cyano; R 27 is independently —CH═, —N═, —C(C 1 -C 8 alkyl)═ or —C(halogen)═, but no adjacent R 27 are both —N═, or two adjacent R 27 are taken together to form a ring having the structure, wherein R a is independently —CH═, —N═, —C(C 1-8 alkyl)═ or —C(halogen)═, but no adjacent R a are both —N═; R 34 is —O—, —S— or —N(CH 3 )—; and X1 is 1, 2 or 3.