CytRx Corporation is a biopharmaceutical research and development company specializing in oncology. The company is focused on the clinical development of aldoxorubicin, its modified version of a chemotherapeutic agent. Aldoxorubicin is a conjugate of the commonly prescribed chemotherapeutic agent doxorubicin that binds to circulating albumin in the bloodstream and is concentrated at the site of tumors. It consists of (6-Maleimidocaproyl) hydrazine, an acid-sensitive molecule that is conjugated to doxorubicin. Its laboratory in Freiburg, Germany is conducting discovery and translational research to create drug candidates that utilize linker technologies that couple chemotherapeutic agents and proteins either inside the body or externally, and then concentrate drug in tumors.