NEURAMINIC ACID COMPOUNDS

摘要

[Constitution] A neuraminic acid compound represented by the formula: (see formula 1) [wherein R1 represents a C1-C4 group which may be substituted with a halogen atom; R2, R3 and R4 may be the same or different and each represents a hydrogen at om or a C3-C25 aliphatic acyl group; and W represents a hydrogen atom or an ester residue, provided that the case where R1 is a methyl group and each of R2, R3, R4 and W is a hydrogen atom is excluded] or a pharmacologically acceptable salt thereof. [Effect] The neuraminic acid compound of the present invention exhibits excellent in vivo sialidase inhibitory activity and is useful as a therapeutic agent or a preventive agent for influenza viral infections.