Novel carbonyl piperazinyl and piperidinyl compounds of formula (1.0) or (1.1) and pharmaceutical compositions are disclosed. Also disclosed is a method of inhibiting Ras function and therefore inhibiting the abnormal growth of cells. The method comprises administering the novel carbonyl piperazinyl or piperidinyl compound to a biological system. In particular, the method inhibits the abnormal growth cells in a mammal such as the human being. A compound of formula (1.0) and (1.1) or a pharmaceutically acceptable salt or solvate thereof, wherein Z is a group which is (i), (ii) or (iii), wherein X1 is CH or N; X2 can be the same or different and can be CH, N, or N-O; b is 0, 1, 2, 3, 4; n and nn independently represent 0, 1, 2, 3, 4 or when X2 is CH, n and nn can be 5; R20 and R21, R1, R2 and R3 are as given in the description.