Doxorubicin

With history dating back to the 1950s, doxorubicin has been used in cancer treatment and chemotherapy. The chemical make up is C27H29NO11 and it is continually being used to treat cancer as well as finding better ways to treat cancer. It often has side effects such as nausea, vomiting, and heart arrhythmias.

http://en.wikipedia.org/wiki/Doxorubicin