2,5-dihydroxybenzoic acid 4955-90-2 BENZOIC ACID,2,5-DIHYDROXY InChI=1/C7H6O4/c8-4-1-2-6(9)5(3-4)7(10)11/h1-3,8-9H,(H,10,11 benzoic acid, 2,5-dihydroxy-