Cor J. Grol,* Hans Rollema, Durk Dijkstra, and Ben H. C. Westerink ... Department of Medicinal Chemistry, State University, Groningen, The Netherlands. Received July 30, 1979 ... The synthesis of the thieno[2,3-b]-, thieno[3,4-b]-, and thieno[3,2-b]benzothiazines with a hydroxyethylpiperazinylpropyl side chain and various 2 substituents is described. The influence of these neuroleptic compounds on dopamine metabolism in vivo is quantitated by determining the rise in homovanillic ...