CAS 5731-13-5 appears in our catalog under these names: 4-(4-Ethylphenyl)benzoic acid, 98%, 4–(4–Ethylphenyl)Benzoic Acid, 4'-Ethylbiphenyl-4-carboxylic acid, 4-Ethyl-[1,1-biphenyl]-4-carboxylic acid 98%, 4-Ethyl-[1,1-biphenyl]-4-carboxylic acid, 98%, 98%. Offered by: Combi-blocks, GLPBio, Biosynth, Ambeed, Chemat. Available pack sizes: 25g, 5g, 1g, 0,5g, 500mg.