| http://www.w3.org/ns/prov#value | - The compound of claim 1 having the structure (1): ##STR51## and tautomers, solvates and salts thereof, wherein R1 is a protecting group, an oligonucleotide, a nucleic acid, a polysaccharide, an optionally protected monosaccharide, hydroxyl, phosphate, hydrogen phosphonate, halo, azido, protected hydroxyl, or --H;R2 is A(Z)X1, but R2 is not amine, protected amine, nitro or cyano; R5 is H or a prote
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