Patent ID: 6995188

Claim:
A method for treating cancer, comprising administering a therapeutically effective amount of a compound having a structure wherein R 1 and R 2 are independently alkyls with 1–10 carbon atoms; X is S or Se; R 3 is —H, —COOH, —CH 2 —COOH, —CH 2 —CH 2 —COOH, —CH(CH 3 )—COOH, —CH(CH 2 —CH 3 )—COOH, or —CH 2 —CH 2 —CH 2 —COOH; n is 0 or 1; R 4 is —OH, —H, —CH 3 , or a glutamine substituent; or or R 3 and R 4 form an unsubstituted or substituted aromatic ring with C 1 and C 2 ; and R 5 is —OH or a glycine substituent; or a pharmaceutically acceptable salt thereof, and one or more other agents or therapies.