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Chemical structures of the indicator dyes 2-fluoro-4-[4-(2-hydroxyethanesulfonyl)-phenylazo]-6-methoxyphenol (GJM-492) and 4-[4-(2-hydroxyethanesulfonyl)-phenylazo]-2,6-dimethylphenol (GJM-503), respectively, and the inert blue dye, Remazol Brilliant Blue R (RBBR).
