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https://www.sigmaaldrich.com/US/en/product/mm/822161 4-Hydroxy-3,5-dimethoxybenzoic acid for synthesis 530-57-4 4-Hydroxy-3,5-dimethoxybenzoic acid for synthesis; CAS Number: 530-57-4; Synonyms: 4-Hydroxy-3,5-dimethoxybenzoic acid,3,5-Dimethoxy-4-hydroxybenzoic acid,... 3 5dimethoxybenzoic acidfor synthesis4hydroxy