C7H6O4 2,3-Dihydroxybenzoic acid 2,4-Dihydroxybenzoic acid 2,5-Dihydroxybenzoic acid 2,6-Dihydroxybenzoic acid 3,4-Dihydroxybenzoic acid 3,5-Dihydroxybenzoic acid Dihydroxybenzoic acid Patulin