1-(2,6-Dichlorophenyl)-1,3-dihydro-2H-indol-2-one; Diclofenac EP Impurity A ; Diclofenac USP Related Compound A; Diclofenac Lactam; Diclofenac Amide; 1-(2,6-dichlorophenyl)indolin-2-one;1-(2,6-Dichlorophenyl)oxindole; N-(2,6-dichlorophenyl)-2-indolinone; Diclofenac Impurity A