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 that allows affinity capture via the biotin-streptavidin interaction with the ability to recover the material.