Synonyms: 1-(2,6-Dichlorophenyl)-1,3-dihydro-2H-indol-2-one, Aceclofenac Imp. I (EP), Diclofenac Sodium Imp. A (EP), Diclofenac Related Compound A (USP), Diclofenac Related Compound A, Aceclofenac Impurity I, Diclofenac Sodium Impurity A, Diclofenac Impurity A.