HRID1846854
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3-Benzyloxy-6-[(2-chloro-benzenesulfonylamino)-methyl]-1-methyl-4-oxo-1,4-dihydro-pyridine-2-carboxylic acid (13-03) (1.7 g, 77.6%) was synthesized as a white solid from 3-benzyloxy-6-[(2-chloro-benzenesulfonylamino)-methyl]-4-oxo-4H-pyran-2-carboxylic acid (12-03) (2.0 g, 4.45 mmol) following the procedure described for 6-(benzenesulfonylamino-methyl)-3-benzyloxy-1-methyl-4-oxo-1,4-dihydro-pyridine-2-carboxylic acid (13-01).