| 摘要 |
A compound of formula (I) useful in treating or preventing herpes viruses wherein, R1 is C1-6 alkyl, optionally substituted with -OH, -OC1-4 alkyl or het or R1 is 3-hydroxy-1-propynyl; wherein C1-6 alkyl is optionally partially unsaturated; wherein het is a radical of a five- or six- membered heterocyclic ring having one or two heteroatoms selected from the group consisting of oxygen, sulfur and N; or a pharmaceutically acceptable salt, racemate, solvate, tautomer, optical isomer or prodrug derivative thereof.
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