I found 3 drugs that can be used as PKA activator: forskolin, 8-Bromo-cAMP, 6-Bnz-cAMP. Forskolin activates cAMP and can activate PKA. The latter two are cAMP analogs that can activate PKA. I'm wondering if any of them is specific to PKA? I think the two cAMP analogs should activate more targets than PKA as it seems like their role is similar as activating cAMP?

If non of them is specific, shall I use forskolin since it's more widely used and I just need to apply a PKA inhibitor with forskolin to show the role of PKA in my study? Thanks.