Synonyms: 2,4-dihydroxybenzoic acid;beta-Resorcylic acid;Benzoic acid, 2,4-dihydroxy-;89-86-1;4-Carboxyresorcinol;beta-Resorcinolic acid;p-Hydroxysalicylic acid;.beta.-Resorcylic acid;4-Hydroxysalicylic acid;b-resorcylic acid;RESORCYLIC ACID, BETA;2,4-Dhba;2,4-Dihydroxy benzoic acid;EINECS 201-946-9;NSC 13564;BRN 1946213;AI3-24366;.beta.-Resorcinolic acid;BRA;2,4-Resorcylic acid;AC1L1BLL;UNII-LU39SC9JYL;AC1Q1GY2;AC1Q72HJ;2,4-Dihydroxy-benzoic acid;Oprea1_259729;MLS001055408;D109401_ALDRICH;W379808_ALDRICH;CHEMBL328910;37530_FLUKA;NSC4740;MolPort-001-641-037;BB_NC-2190;HMS3039A13;41453-50-3 (lead salt);NSC-4740;NSC13564;AR-1I0746;BBL011673;NSC-13564;STK299216;AKOS001434143;DB02839;LS-1901;NCGC00090922-01;NCGC00090922-02;17289-70-2 (mono-hydrochloride salt);AC-10404;SMR001227190;ST097458;D0568;115808-EP2295416A2;115808-EP2298748A2;4-10-00-01420 (Beilstein Handbook Reference);L001160;I01-1418;T5895563;InChI=1/C7H6O4/c8-4-1-2-5(7(10)11)6(9)3-4/h1-3,8-9H,(H,10,11