the actions of three different phosphodiesterase inhibitors , theophylline , 3-isobutyl-1-methylxanthine ( ibmx ) and ro 20-1724 ( ro ) , on cellular camp and pepsinogen secretion from dispersed chief cells prepared from guinea pig stomach were examined .
C0039771
theophylline
C0000096
3-isobutyl-1-methylxanthine