the effects of the novel alkylxanthine denbufylline ( 1,3-d-n-butyl-7- ( 2'-oxopropyl ) -xanthine ) , theophylline and 3-isobutyl-1-methyl-xanthine ( ibmx ) , on the breakdown of cyclic amp in homogenates of rat erythrocytes , abdominal aorta , adipocytes and cardiac and skeletal muscle were studied .
C0039771
theophylline
C0000096
3-isobutyl-1-methyl-xanthine