Hi Folks: After seeing the interest expressed about L-DOPA ethyl ester, I did a quick web search and found the following info concerning a patent on this drug: Patent Number 5607969 Issue Date 1997 03 04 Assignee Yissum Research Development Company of the Hebrew University of Jerusalem Teva Pharmaceutical Industries Ltd. Inventor(s) Milman, Isaac Veinberg, Alexander Atlas, Daphne Melamed, Eldad Title L-DOPA ethyl ester to treat Parkinson's disease Abstract Patients suffering from Parkinson's disease are treated by administering a composition which contains an active ingredient and a pharmaceutically acceptable carrier. The active ingredient comprises L-DOPA ethyl ester in an amount which is at least 97% by weight of the active ingredient and L-DOPA in an amount which is less than 1% by weight of the active ingredient.