4-((2-(Acetyl(4-methoxyphenyl)amino)-1-oxopropyl)(4-methoxyphenyl)amino)butanoic acid 71455-78-2 Butanoic acid, 4-((2-(acetyl(4-methoxyphenyl)amino)-1-oxopropyl)(4-methoxyphenyl)amino)- N-(N-Acetyl-2-(p-anisidino)propionyl)-4-(p-anisidino)butyric acid