the potencies of caffeine , theophylline , lysine-theophylline and 3-isobutyl-1-methylxanthine ( ibmx ) in stimulating sperm motility have been compared , and we have found ibmx to be significantly more potent than the other three compounds , which did not exhibit significant differences in potency from each other .
C0039771
theophylline
C0000096
3-isobutyl-1-methylxanthine