Hmmm

 So i found some articles that seemed to think it may be safer to work from outside the blood brain barrier. Not all...

And as fir thise that can cross, have nit yet found a comprehensive list, but apart from JQ1, at least...

OTX015 (MK-8628)

And

"The potent BET inhibitor TEN-010, a derivative of JQ1"

Can

Prob others as well.