1 679 2-chloro-5-[4-(3-chloro-phenyl)-2,5-dioxo-2,5-dihydro-1h-pyrrol-3-ylamino]-benzoic acid 1.000 2 2RF 3-[(3-chloro-4-hydroxyphenyl)amino]-4-(3-chlorophenyl)-1h-pyrrole-2,5-dione 0.778