The invention relates to compounds comprising a Co3+ ion and a tyrosine kinase inhibitor moiety, wherein the tyrosine kinase inhibitor moiety comprises a Co3+-chelating moiety and wherein the tyrosine kinase inhibitor moiety is a 4-anilinoquinazoline tyrosine kinase inhibitor moiety. The 4-anilinoquinazoline tyrosine kinase inhibitor moiety has the general formula B, wherein R1, R2, R3 and m are as defined herein. The compounds are useful in the treatment of hyperproliferative diseases, such as cancer.
