it will answer all your questions
Beans, roots and leaves
A History of the Chemical Therapy
of Parkinsonism
by
Paul Bernard Foley
B.Sc. (Hons) (Macquarie), M.A. (Würzburg)
Doctoral dissertation submitted to the Bavarian Julius Maximilian University,
Würzburg (2001)
http://d-nb.info/96446392X/34