Benzeneacetic acid, α-ethyl-3-nitro- 2-(3-Aminophenyl)butyric acid ethyl 2-(4-nitrophenyl)butanoate Benzeneacetic acid, 4-amino-α-ethyl-, methyl ester Benzeneacetic acid, 4-(1,3-dihydro-1-oxo-2H-isoindol-2-yl)-α-ethyl-, ethyl ester Indobufen Impurity 41 Indobufen Impurity 3 Isophthalic acid Benzeneacetic acid, 4-(1,3-dihydro-1-oxo-2H-isoindol-2-yl)-α-ethyl-, (αR)- 1H-Isoindole-1,3(2H)-dione, 2-(4-propylphenyl)- Indobufen Impurity A Indobufen Impurity 2 Sodium Salt Indobufen Impurity 9 Benzeneacetic acid, 4-(1,3-dihydro-1-oxo-2H-isoindol-2-yl)-α-ethyl-, methyl ester Benzeneacetonitrile, 4-amino-α-ethyl- Benzeneacetic acid, α-ethyl-2-nitro- 1-NITRO-4-N-PROPYLBENZENE Indobufen Impurity 2