The disclosure relates generally to alpha polyglutamated pemetrexed, formulations containing liposomes filled with alpha polyglutamated pemetrexed, methods of making the alpha polyglutamated pemetrexed and liposome containing formulations, and methods of using polyglutamated alpha polyglutamated pemetrexed and liposome containing formulations to treat hyperproliferative disorders (e.g., cancer) and disorders of the immune system (e.g., an autoimmune disease such as rheumatoid arthritis).
