CRL-40,941

CRL-40,941 (Fladrafinil) is a mild central nervous system stimulant drug closely related to adrafinil and modafinil. It is the bis(p-fluoro) ring-substituted derivative of adrafinil and has similar effects in animal tests and human trials. The fluorine substitution increases the potency to around twice that of adrafinil. CRL-40,941 was found to produce anti-aggressive effects in animals, which adrafinil does not produce.

As of late 2013 CRL-40,941 has been seen on the recreational drug markets.