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5‐Hydroxymethylfurfural (5‐HMF) is a natural occurring substance taken up by everyday food. In former studies it was shown that 5‐HMF is completely decomposed in the body after oral or intravenous application resulting in three main metabolites named 5‐hydroxymethylfuroic acid, 2,5‐furandicarboxylic acid, and N‐(hydroxymethyl)furoyl glycine, and possibly a forth metabolic substance, termed 5‐sulphoxymethylfurfural,...