NUVIGILŪ (armodafinil) is a wakefulness-promoting agent for oral administration. Armodafinil is the R-enantiomer of modafinil which is a mixture of the R- and S-enantiomers. The chemical name for armodafinil is 2-[(R)-(diphenylmethyl) sulfinyl] acetamide. The molecular formula is C15H15NO2S and the molecular weight is 273.35.