Provided relates to pharmaceutically acceptable salts of conjugates including a chemotherapeutic drug and an amino acid or a derivative thereof, which are readily taken up by a target cell and reduce side effects induced by the chemotherapeutic drug. Further, the subject matter relates to pharmaceutically acceptable salts of conjugates comprising cytidine analog drugs and aspartic or glutamic acid and analogs thereof, pharmaceutical compositions including these conjugates and use thereof for the treatment of cancer or a pre-cancer condition or disorder.
