| 摘要 |
A compound of formula (I): <CHEM> or a pharmaceutically acceptable salt or ester thereof, in which Y is a hydrogen or halogen atom, preferably a bromine atom, and each of R<1>, R<2> and R<3> is a hydrogen atom; an acyl radical of the formula <CHEM> in which X is a C1-12 alkyl group an optionally substituted phenyl, or optionally substituted benzyl group, or a carboxy group of the formula <CHEM> in which Z is a branched or straight chain alkylene radical having from 1 to 4 carbon atoms in the chain; an optionally substituted C1-12 alkoxycarbonyl group; an optionally substituted C3-12 alkenyloxycarbonyl group; an optionally substituted phenoxycarbonyl group; or an optionally substituted phenyl C1-6 alkoxycarbonyl group; provided at least one of R<1>, R<2> and R<3> is an optionally substituted alkoxycarbonyl. optionally substituted alkenyloxycarbonyl, optionally substituted phenoxycarbonyl or optionally substituted phenyl C1-6 alkoxycarbonyl group, is useful in treating virus infections. |
