IBMX, 3-isobutyl-1-methylxanthine, like other methylated xanthine derivatives, is both a As a phosphodiesterase inhibitor, IBMX has IC50 = 2-50 μM and does not inhibit PDE8 or PDE9. ...
(= isobutylmethylxanthine) Often used as an inhibitor of cAMP phosphodiesterase as a way of raising intracellular cAMP levels for experimental purposes.