Conjugate including core and sialic acid or derivative thereof bound to surface of core and use thereof

A conjugate comprising a core and ligands bound to the surface of the core, the core including polyamidoamine and each of the ligands being a sialic acid derivative, wherein:

• the core is a fourth-generation (G4) dendrimer and
• the ligands are arranged with spacing of 2.0 nm to 3.1 nm on the surface of the core, or
• 20 to 31 of the ligands are bound to the surface of the core;
• or
• the core is a fifth-generation (G5) dendrimer and
• the ligands are arranged with spacing of 1.6 nm to 2.4 nm on the surface of the core, or
• 37 to 56 of the ligands are bound to the surface of the core;
• and the sialic acid derivative is sialyloligosaccharide or sialyllactose.