| 摘要 |
Compounds represented by general formula (I) and salts thereof useful as non-tolerance-inducing antiviral agents, wherein A is O, CH2 or S; R<1> is lower alkoxycarbonyl, COOH or the like; R<2> is H, OR<6>, F, Cl, Br, CN, NHR<6> or SR<6> (wherein R<6> is H, C1-C6 lower alkyl or the like); one of R<3> and R<3'> is H and the other thereof is H, CN, a nitrogenous group such as amino, or the like; R<4> is -NHR<6> or -N=CHR<6>; and R<5> is CH2CH2XR<6> or CH(XR<6>)CH2XR<6> (wherein X is O, S or NH). |
