Mannosylated compounds useful for the prevention and the treatment of infectious diseases

A compound of formula (I)

• wherein:
• R1 is a C17-C30 saturated or unsaturated linear alkyl optionally substituted by one or more C1-C3 alkyl radicals,
• M2-Q2 and M3-Q3 are optionally present,
• M1 is selected from the group consisting of mannosyl, dimannosyl, and trimannosyl,
• M2 et M3 are independently selected from the group consisting of mannosyl, dimannosyl, trimannosyl, and therapeutic agent moieties having a molecular weight of at most 800 g/mol−1,
• Q1, Q2 and Q3 are independently selected from the group of oligoether-based spacers comprising at least one —(R8O)n— moiety wherein R8 is a linear or branched C1-C4 alkyl, and n is an integer from 2 to 10, and
• LINKER is selected among bifunctional, trifunctional and tetrafunctional linkers having a backbone of 1 to 20 carbon atoms and at least two heteroatoms independently selected from N, S and O,
• or a pharmaceutically acceptable salt or solvate thereof.