<unk>  (code name CRL-41056) is an achiral, oxidized metabolite of modafinil, a wakefulness-promoting agent. It is one of two major circulating metabolites of modafinil, the other being modafinil acid.<unk>  is also a metabolite of the modafinil prodrug, adrafinil.<unk>  is also a metabolite of armodafinil, the (R)-(–)-enantiomer of modafinil, as oxidation to the<unk>  removes the chiral center at the sulfur atom.<unk>  has been described as inactive, and similarly to modafinil acid, does not appear to contribute to the wakefulness-promoting/psychostimulant effects of modafinil. However, like modafinil,<unk>  was found to show anticonvulsant properties in animals, indicating that it does possess some biological activity.
Modafinil sulfone
Modafinil acid
Armodafinil
Olsalazine
Benzyl benzoate
Adrafinil
Chloracyzine
Drupanol