3,4-dichlorobenzoic acid 51-44-5 BENZOIC ACID,3,4-DICHLORO InChI=1/C7H4Cl2O2/c8-5-2-1-4(7(10)11)3-6(5)9/h1-3H,(H,10,11 benzoic acid, 3,4-dichloro-