CRL-40,941, also named fladrafinil, is 2-[bis(4-fluorophenyl)methylsulfinyl]-N-hydroxyacetamide: a bis(4-fluorophenyl) analogue of adrafinil and a structural analogue of modafinil. Its non-hydroxylated counterpart is CRL-40,940 (flmodafinil). Published research on fladrafinil is very limited. The peer-reviewed studies indexed on PubMed are analytical: one characterised its thermal degradation during gas chromatography, and one examined its metabolism and elimination for sports drug testing. No primary pharmacology studies in cell or animal models were found.