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

Phosphoramidite for incorporation of Biotin with a dT nucleobases, internally or at the 5' end of an oligonucleotide.

Phosphoramidite for incorporation of Biotin at the 5' end of an oligonucleotide.

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