Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Having -c- – wherein x is chalcogen – bonded directly to...
Reexamination Certificate
2005-10-25
2005-10-25
Rao, Deepak (Department: 1624)
Drug, bio-affecting and body treating compositions
Designated organic active ingredient containing
Having -c-, wherein x is chalcogen, bonded directly to...
C544S314000, C544S317000
Reexamination Certificate
active
06958345
ABSTRACT:
Compounds which are active against viruses have the following Formulas:wherein B is a purine or pyrimidine heterocyclic ring and is preferably selected from the group consisting of 6-aminopurine (adenine), 2,6-diaminopurine, 2-amino-6-azidopurine, 2-amino-6-cyclopropylaminopurine, 6-hydroxypurine (hypoxanthine), 2-amino-6-halo substituted purines, 2-amino-6-alkoxy substituted purines, 2-amino-6-hydroxypurine (guanine), 3-deazapurines, 7-deaza-purines, 8-azapurines, cytosine, 5-halo substituted cytosines, 5-alkyl substituted cytosines, thymine, uracil and 6-azapyrimidines; X is O; and, R1and R2are alkyl or aryl groups. The compounds of the present invention also include the R- and S-enantiomers of the above compounds. The R1X and/or R2X can also be amino acid residues with X as NH.
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Drach John C.
Ptak Roger G.
Qiu Yao-Ling
Zemlicka Jiri
Foley & Hoag LLP
Rao Deepak
The Regents of the University of Michigan
Wayne State University
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