one of the cyclic amp analogs , dibutyryl cyclic amp ( dbcamp ) or 8-bromo-cyclic amp ( 8-br-camp ) , or one of the pde inhibitors , theophylline or isobutylmethylxanthine ( ibmx ) , was added to the culture medium .
C0001455
cyclic amp
C0000661
8-bromo-cyclic amp