| 摘要 |
B2754/Abs The (R)-isomer or the (S)-isomer of a compound of formula (IA), optionally in admixture with up to 45% of the mixture by weight of the corresponding (S)-isomer or the (R)-isomer respectively: (IA) wherein R11 is hydroxy or amino; R21 is amino or hydrogen; R31 is hydroxymethyl or acyloxymethyl; and 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: B2754/Abs wherein R6 is as defined above; having antiviral activity, a process for their preparation and their use in the treatment of viral infections or neoplastic diseases.
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