Patent ID: 7390832

Claim:
A method of treating a cancer selected from the group consisting of leukemia, non-small cell lung cancer, colon cancer, central nervous system cancer, melanoma, ovarian cancer, renal cancer, ovarian cancer, prostate cancer, and breast cancer, in a patient in need thereof, said method comprising administering to a patient a cancer-treating effective amount of a compound of formula I wherein R 1 -R 4 are each independently pyridyl, wherein the pyridyl is linked to a respective linkage L 3 through a nitrogen atom of the pyridyl, and wherein the pyridyl is linked to a respective linkage L 1 through any of the nitrogen or carbon atoms of the pyridyl other than the nitrogen atom that links to linkage L 3 ; R 5 -R 6 are each independently an anion or uncharged species; R 7 is a hydrogen, halogen, hydroxy, or a C 1 -C 6 alkyl group; R 5 -R 9 are each independently a hydrogen, hydroxy, a C 1 -C 3 alkyl group, or a halogen; each L 1 is independently a C 1 -C 6 alkyl or ether linkage; and each L 3 is a direct bond.