What Is Fladrafinil and Why Are Researchers Interested in This Eugeroic Compound? Fladrafinil formally known as fluorafinil or CRL-40,941 is a synthetic benzhydryl sulfinyl compound belonging to the eugeroic class of wakefulness-promoting research chemicals. It is structurally related to adrafinil and modafinil, from which it is distinguished by the addition of a para-fluoro group on the...