5,5'-(3H-2,1-Benzoxathiol-3-ylidene)bis(3-methylsalicylic) acid S,S-dioxide, sodium salt;sodium 5-[3-(3-carboxy-4-hydroxy-5-methyl-phenyl)-1,1-dioxo-benzo[c]oxathiol-3-yl]-2-hydroxy-3-methyl-benzoate
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