C12 H22 H11 -> C2 H10 O6 -> C2 H5 OH -> CH3 COOH -> CH3 COOC2 H5 -> C2 H5 OH. C6 H10 O5 -> C6 H12 O6 -> CH3 COOH -> CH3 COOC2 H5 -> CH3 COOK
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