8-CPT-2Me-cAMP sodium is a sodium salt compound that selectively activates exchange proteins activated by cAMP (Epac). These Epac proteins are cAMP-sensitive guanine nucleotide exchange factors (GEFs) responsible for activating small GTPases Rap1 and Rap2. 8-CPT-2Me-cAMP sodium specifically activates Epac1 with an EC50 value of 2.2 μM, while showing no activation of PKA with an EC50 value greater than 10 μM [1]. Additionally, 8-CPT-2Me-cAMP sodium stimulates the Epac-mediated release of calcium ions (Ca2+) in vitro in pancreatic β-cells [2].