The invention concerns compounds of the general formula (I) in which i:he residues R1 to R7 have the meanings given in the application as well as methods for their preparation. The compounds are in particular suitable as substrates for RNA or DNA polymerases and can thus be incorporated into RNA or DNA...http://www.google.com.au/patents/US6403786?utm_source=gb-gplus-sharePatent US6403786 - Heterocyclic compounds and their use for isolating nucleic acids
