A compound (i) having the general formula wherein R 2 represents -F, -Cl, -Br, -I, -O-C 1-8 -alkyl, -S-phenyl, -S-C 1-8 -alkyl-C(=O)NH-phenyl, -NH-C 1-8 -alkyl, -NH-C 1-8 -alkyl-CO 2 H, or -NH-C 1-8 -alkyl-phenyl; or having the general formula wherein X represents -S-; Y represents -C-R 10; R 9 and R 10, independently of one another, represent -C(=O)-C 1-8 -alkyl-NH-phenyl or -NH 2; or (ii) having the general formula wherein X represents -S-; Y represents -C-R 10; R 10 represents -C(=O)-CH 2 -NH-phenyl or -NH 2; or (iii) having the general formula wherein R 2 represents -Cl, -O-C 1-8 -alkyl, -S-phenyl, -S-C 1-8 -alkyl-C(=O)NH-phenyl, -NH-C 1-8 -alkyl, -NH-C 1-8 -alkyl-CO 2 H, or -NH-C 1-8 -alkyl-phenyl; or having the general formula wherein X represents -S-; Y represents -C-R 10; R 10 represents -C(=O)-CH 2 -NH-phenyl; or (iv) having the general formula wherein R 2 represents -NH-C 1-8 -alkyl or -NH-C 1-8 -alkyl-CO 2 H, wherein -C 1-8 -alkyl is unsubstituted; or (v) having the general formula wherein R 2 represents -O-C 1-8 -alkyl or -NH-C 1-8 -alkyl-CO 2 H, wherein -C 1-8 -alkyl is unsubstituted; or (vi) having the formula or (vii) having the formula or a physiologically acceptable salt thereof; for use in the treatment of cancer. (i) having the general formula wherein R 2 represents -F, -Cl, -Br, -I, -O-C 1-8 -alkyl, -S-phenyl, -S-C 1-8 -alkyl-C(=O)NH-phenyl, -NH-C 1-8 -alkyl, -NH-C 1-8 -alkyl-CO 2 H, or -NH-C 1-8 -alkyl-phenyl; or having the general formula wherein X represents -S-; Y represents -C-R 10; R 9 and R 10, independently of one another, represent -C(=O)-C 1-8 -alkyl-NH-phenyl or -NH 2; or R 2 represents -F, -Cl, -Br, -I, -O-C 1-8 -alkyl, -S-phenyl, -S-C 1-8 -alkyl-C(=O)NH-phenyl, -NH-C 1-8 -alkyl, -NH-C 1-8 -alkyl-CO 2 H, or -NH-C 1-8 -alkyl-phenyl; or having the general formula wherein X represents -S-; Y represents -C-R 10; R 9 and R 10, independently of one another, represent -C(=O)-C 1-8 -alkyl-NH-phenyl or -NH 2; or X represents -S-; Y represents -C-R 10; R 9 and R 10, independently of one another, represent -C(=O)-C 1-8 -alkyl-NH-phenyl or -NH 2; or (ii) having the general formula wherein X represents -S-; Y represents -C-R 10; R 10 represents -C(=O)-CH 2 -NH-phenyl or -NH 2; or X represents -S-; Y represents -C-R 10; R 10 represents -C(=O)-CH 2 -NH-phenyl or -NH 2; or (iii) having the general formula wherein R 2 represents -Cl, -O-C 1-8 -alkyl, -S-phenyl, -S-C 1-8 -alkyl-C(=O)NH-phenyl, -NH-C 1-8 -alkyl, -NH-C 1-8 -alkyl-CO 2 H, or -NH-C 1-8 -alkyl-phenyl; or having the general formula wherein X represents -S-; Y represents -C-R 10; R 10 represents -C(=O)-CH 2 -NH-phenyl; or R 2 represents -Cl, -O-C 1-8 -alkyl, -S-phenyl, -S-C 1-8 -alkyl-C(=O)NH-phenyl, -NH-C 1-8 -alkyl, -NH-C 1-8 -alkyl-CO 2 H, or -NH-C 1-8 -alkyl-phenyl; or having the general formula wherein X represents -S-; Y represents -C-R 10; R 10 represents -C(=O)-CH 2 -NH-phenyl; or X represents -S-; Y represents -C-R 10; R 10 represents -C(=O)-CH 2 -NH-phenyl; or (iv) having the general formula wherein R 2 represents -NH-C 1-8 -alkyl or -NH-C 1-8 -alkyl-CO 2 H, wherein -C 1-8 -alkyl is unsubstituted; or (v) having the general formula wherein R 2 represents -O-C 1-8 -alkyl or -NH-C 1-8 -alkyl-CO 2 H, wherein -C 1-8 -alkyl is unsubstituted; or (vi) having the formula or (vii) having the formula or a physiologically acceptable salt thereof; for use in the treatment of cancer. or a physiologically acceptable salt thereof; for use in the treatment of cancer.