| 摘要 |
Compounds of formula I or a pharmaceutically acceptable salt thereof: <IMAGE> I in which formula R1 represents an aliphatic hydrocarbyl group; Ar represents a substituted or unsubstituted aromatic nucleus; X represents -SO2- or -CO- and R2 and R3 which may be identical or different represent moieties of formula (a), (b), (c), (d), (e), (f), (g), (h) or (i): <IMAGE> (a) <IMAGE> (b) <IMAGE> (c) <IMAGE> (d) <IMAGE> (e) <IMAGE> (f) <IMAGE> (g) <IMAGE> (h) <IMAGE> (i) wherein B represents the residue of a nucleoside base of formula (A), (G), (C), (H) or (T): <IMAGE> (A) <IMAGE> (G) <IMAGE> (C) <IMAGE> (H) <IMAGE> (T) provided that when R2 and R3 both represent an unsubstituted moiety of formula (a) B represents the residue of a nucleoside base which is of formula (A), (G), (C) or (H) are of value for their antiviral activity.
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