[4,4'-Bi-3H-pyrazole]-3,3'-dione, 2,2',4,4'-tetrahydro-5,5'-dimethyl-2-phenyl-

5-Methyl-4,5-dihydro-3H-pyrazol-3-one Edaravone is an impurity of Edaravone (E335000). Edaravone inhibits the disease activity in rheumatoid arthritis. It also shows protective effects against STZ-induced cognitive impairment, oxidative stress, cholinergic dysfunction and altered protein expressions.