Phosphoramidite used to incorporate a dinitrophenyl-modification, either internally or at the terminus of an oligonucleotide.

Phosphoramidite for incorporation of a 2-amino-modified purine in a synthetic oligonucleotide.

Phosphoramidite for incorporation of Biotin with a triethylene glycol spacer internally or at the 5' end of an oligonucleotide.