| abstract |
A compound represented by the following general formula (I) which has annantiviral activity:n nwherein R 1 represents hydrogen atom, C 1 -C 6 alkyl group, or C 7 -C 10 aralkyl group; R 2 nrepresents C 1 -C 6 alkyl group, C 7 -C 10 aralkyl group, or phenyl group; R 3 and R 4 nindependently represent hydrogen atom, C 1 -C 6 alkyl group, acyloxymethyl group,nacylthioethyl group, or ethyl gorup substituted with at least one halogen atom; R 5 nrepresents hydrogen atom, C 1 -C 4 alkyl gorup, C 1 -C 4 hydroxyalkyl group, C 1 -C 4 alkylngroup substituted with at least one halogen atom; and X represents carbon atom ornnitrogen atom. |