Pyrimidine nucleoside derivatives and salts thereof

Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Carbohydrate doai

Reexamination Certificate

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C514S274000, C536S027400, C544S309000, C544S311000, C544S312000, C544S314000

Reexamination Certificate

active

08076302

ABSTRACT:
A novel pyrimidine nucleoside derivative represented by the following formula (1) and a salt thereof, as well as a pharmaceutical composition comprising the same as an active ingredient have excellent antiviral properties and are useful as antiviral therapeutic agents:[wherein R represents a nitrogen-containing heterocyclic ring which may have any one of a C1-C3alkyl group or a C1-C3alkoxy group as a substituent, or a C1-C6alkyl group which has one primary amino group as a substituent].

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