Phosphoramidite used to incorporate a C-5 propyne modified dU either internally or at the 5' end of an oligonucleotide.

Nucleoside phosphoramidite useful in Click Chemistry reactions.

Phosphoramidite for the direct incorporation of an ethynyl-dU-linked anthraquinone into an oligonucleotide, providing an electronic coupling to the nucleobase pi-stack.