| abstract |
Compounds of the formula ##STR1## wherein R 1 and R 2 are each independently of the other hydrogen or a protecting group, or n R 1 has those meanings and n R 2 is a radical forming a phosphorus-containing nucleotide bridge group; n B is a purine or pyrimidine radical or an analogue thereof; and n R 3 is OH, or F, and oligonucleotides that comprise those nucleosides are described. |