Increase of immune response and targeting by antigens and/or drug linkage

A compound having Formula (I):

• wherein,
• R1, R2, R3, and R4 are each independently hydrogen, C1-C6 alkyl, C6-C12 aralkyl, or C1-C6 acyl;
• and R1 is either above or below the sugar ring;
• R6 is a) —(CH2)xCH3 where x is an integer selected from 1 to 100;
• or
• b) —(CH2)xCH═cH(CH2)yCH3 or —(CH2)xCH═CH(CH2)yCH═CH(CH2)zCH3
• wherein x, y and z are integers independently selected from 1 to 14;
• R5 is one of the following formulae (II), (III) or (IV)
• wherein R8 is hydrogen, C1-C6 alkyl, C6-C12 aralkyl, or C1-C6 acyl, and
• R7 is a linear or branched C3-C100 alkyl;
• X is —O, N or S;
• Y is a cleavable or non-cleavable linker group;
• and
• Z is an antigen or a drug or a pharmaceutically acceptable salt thereof.