Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Structure-activity relationship of 8-styrylxanthines for in vivo adenosine A 2A antagonism were explored. Diethyl substitution both at the 1- and 3-position was found to dramatically potentiate the anti-cataleptic activity. ... Structure-activity relationships of 8-styrylxanthines for in vivo ...