A compound having the following formula (I): wherein groups R1 and R2 independently represent functional groups selected from
hydrogen and aliphatic chains; R3 represents a functional group selected from
hydrogen and methyl; R5 represents a functional group selected from
hydrogen, methyl, and
methylene; R6 represents a functional group selected from hydrogen, methyl,
methylene, ethyl, and
ethylene; and wherein group Q is a
carborane substituent having the following molecular formula: C2B 10 H 11 R7; where R7 represents a functional group selected from hydrogen and aliphatic chains; or a pharmaceutically acceptable derivative thereof, which is used as a
drug.