the response to 2-chloroadenosine was antagonized by the xanthine adenosine-antagonists , cyclopropyltheophylline , 8-phenyltheophylline , 3-isobutyl-1-methylxanthine and theophylline , and the non-xanthine alloxazine .
C0000096
3-isobutyl-1-methylxanthine
C0039771
theophylline