The present invention relates to the preparation of the optical isomer
(R)-(+)-8,9-dihydroxy-2,3,7,11b-tetrahydro-1H-napth[1,2,3-de]isoquinoline-
. This invention also relates to the use of pharmaceutical compositions
comprising
(R)-(+)-8,9-dihydroxy-2,3,7,11b-tetrahydro-1H-napth[1,2,3-de]isoquinoline
for use for the treatment of movement disorders.