2,6-dihydroxybenzoic acid 303-07-1 BENZOIC ACID,2,6-DIHYDROXY MFC7 H6 O4 InChI=1/C7H6O4/c8-4-2-1-3-5(9)6(4)7(10)11/h1-3,8-9H,(H,10,11 benzoic acid, 2,6-dihydroxy-