| 摘要 |
Compounds of formula (I), and pharmaceutically acceptable salts thereof: <IMAGE> (I) wherein R1 is hydrogen or CH2OH; R2 is hydrogen or, when R1 is hydrogen, hydroxy or CH2OH; R3 is CH2OH or, when R1 and R2 are both hydrogen, CH(OH)CH2OH; R4 is hydrogen, hydroxy, amino or OR5 wherein R5 is C1-6 alkyl, phenyl or phenyl C1-2 alkyl either of which phenyl moieties may be substituted by one or two halo, C1-4 alkyl or C1-4 alkoxy groups; and in which any OH groups in R1, R2 and R3 may be in the form of O-acyl, phosphate, cyclic acetal or cyclic carbonate derivatives thereof; having antiviral activity.
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