Provided is a method of forming a copper-containing complex, including contacting a sample containing copper with a compound of Formula I: wherein R is —OH or —O—CH3. Also provided is a method of inhibiting enzymatic activity of a kinase in a sample, including contacting the sample with a compound of Formula I. Further provided is a method of administering to a subject a pharmaceutical composition including a compound of Formula I optionally complexed with copper. Also provided is a pharmaceutical composition including copper complexed with a compound of Formula I.