Guanine derivative
Patent 6107302 Issued on August 22, 2000. Estimated Expiration Date: 
September 22, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 22, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Inventors
ApplicationNo. 875173 filed on 09/22/1997US Classes:514/263.38, Chalcogen attached indirectly to the 9- position of the purine ring system by acyclic nonionic bonding544/229, Boron or silicon containing544/244, Polycyclo ring system having the diazine ring as one of the cyclos544/267, At 2- and 6-positions (e.g., theophyllines, etc.)544/276, Nitrogen attached directly or indirectly to the purine ring system by nonionic bonding544/277Nitrogen attached directly or indirectly to the purine ring system by nonionic bondingExaminersPrimary: Travers, RussellAttorney, Agent or FirmForeign Patent References
International ClassesA01N 043/90C07F 005/02 C07F 009/02 C07D 473/00 Foreign Application Priority Data1995-01-20 GBAbstractThe invention relates to an anhydrous crystalline form of (2-[2-amino-1,6-dihydro-6-oxo-purin-9-yl)methoxy]ethyl L-valinate hydrochloride (otherwise known as valaciclovir hydrochloride) and a process for preparing it.Other References
Field of SearchAt 2- and 6-positions (e.g., theophyllines, etc.)Nitrogen attached directly or indirectly to the purine ring system by nonionic bonding Nitrogen attached directly or indirectly to the purine ring system by nonionic bonding Boron or silicon containing Polycyclo ring system having the diazine ring as one of the cyclos |
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