The Glucose-6-phosphate reference article from the English Wikipedia on 24-Apr-2004
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Glucose-6-phosphate

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Glucose-6-phosphate (G6P) is a phosphorylated glucose molecule on carbon 6. G6P is the product of the first step of glycolysis. The phosphorylation of glucose to lead to G6P is catalyzed with hexokinase enzymes, this consuming one ATP.

Its empirical formula is C6H13O9P.