#$%^&*AU2019210664A120190822.pdf#####ABSTRACT Sialic acid derivatives of the formula (1) H H A 1 -Y 1-N R R1 H R4 -I R2 3 A2 (1) 5 in which the symbols have the definitions indicated in the description are suitable as medicaments, especially of diseases whose course is influenced by Siclec ligands.