the ability of 1,3,8-substituted xanthines ( 1,3-dipropyl-8- ( 4- ( 2-aminoethyl ) amino ) carbonylmethyloxyphenyl ) xan thine ( xac ) , 1,3-dipropyl-8- ( 4-carboxymethyloxyphenyl ) xanthine ( xcc ) , 1,3-dipropyl-8- ( 2-amino-4-chlorophenyl ) xanthine ( pacpx ) , 1,3-dipropyl-8-cyclopentylxanthine ( dpcpx ) , 1,3-diethyl-8-phenylxanthine ( dpx ) and 8-phenyltheophylline ( 8-pt ) ) , of 1,3,7-substituted xanthines ( 1-propargyl-3,7-dimethylxanthine ( pgdmx ) and caffeine ) , and of a 3-substituted xanthine ( enprofylline ) to antagonize the inhibitory effect of 2-chloroadenosine ( cado ) on the amplitude of nerve-evoked twitches was investigated in innervated sartorius muscles of the frog .
C0043314
xanthine
C0043318
xanthines