| 摘要 |
B2752/Abs Compounds of formula (I), and pharmaceutically acceptable salts thereof: (I) wherein R1 is hydroxy or amino; R2 is hydrogen or amino; R3 is hydrogen, hydroxymethyl or acyloxymethyl; R4 is a group of formula: wherein R5 and R6 are independently selected from hydrogen, C1-6 alkyl and optionally substituted phenyl; or R3 and R4 together are: wherein R6 is as defined above; having antiviral activity, processes for their preparation and their pharmaceutical use.
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