Pyrimidine nucleoside derivative and antiviral agent containing the derivative as active ingredient
 A pyrimidine nucleoside derivative and pharmaceutically acceptable salt thereof specified by the presence of ethyl group or isopropyl group at 5-position of the pyrimidine ring and the presence of a (substituted) phenylthio or a (substituted) benzyl group at 6-position of the pyrimidine ring is provided. The pyrimidine nucleoside derivative and pharmaceutically acceptable salt thereof show a markedly higher anti-retroviral activity than conventional analogous compounds and have a relatively low toxicity against the host cells, and therefore, are useful as an active ingredient of antiviral agent. 
Mitsubishi Kasei Corporation
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inventional inventional inventional inventional
Masanori Tadashi Masaru Erik D. A. Hiromichi Richard T.
Baba Miyasaka Ubasawa De Clercq Tanaka Walker