We synthesized polyvalent sialidase inhibitors bearing 4-guanidino-Neu5Ac2en analogues on the polyglutamic acid back bone, via a spacer of alkyl ether at the C-7 position. These multivalent conjugates 9 and 10 showed enhancement of antiviral activity against infuenza A virus and more potent efficacy in vivo relative to a monomeric sialidase inhibitor.
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