Des-methyl analog of cytidine useful for probing the hydrogen-bonding characterisitcs in oligonucleotides.

Phosphoramidite to incorporate an amino functionality on deoxyuridine, for post-synthetic conjugation.

Phosphoramidite for incorporation of a 9-atom spacer (TEG, triethylene glycol) internally or at the 5' end of an oligonucleotide.