CAS 51-44-5 appears in our catalog under these names: 3,4-Dichlorobenzoic acid, min. 95 %, 5 kg, 3,4–Dichlorobenzoic Acid, 3,4-Dichlorobenzoic acid/ 99%, 3,4-Dichlorobenzoic acid, 99% , 3,4-Dichlorobenzoic acid. Offered by: Roth, GLPBio, Chemat, Thermo Scientific (Alfa Aesar), Biosynth. Available pack sizes: 5kg, 100g, 250g, 500g, 25g, 2kg, 10kg, 25kg.