agents which putatively act by increasing intracellular levels of adenosine 3',5'-monophosphate ( cyclic amp ) ( isoproterenol , histamine , theophylline , papaverine , dibutyryl cyclic amp ) and ca++ were found to restore excitability and contractions to k+-depolarized hearts .
C0001455
cyclic amp
C0012054
dibutyryl cyclic amp