C([O:4][CH2:5][C:6]1[C:15]2[C:10](=[CH:11][CH:12]=[C:13]([O:16][CH3:17])[CH:14]=2)[CH:9]=[CH:8][CH:7]=1)(=O)C.[OH-].[Na+]>CO.O>[OH:4][CH2:5][C:6]1[C:15]2[C:10](=[CH:11][CH:12]=[C:13]([O:16][CH3:17])[CH:14]=2)[CH:9]=[CH:8][CH:7]=10.1 mole of the preceding 1-acetoxymethyl-7-methoxynaphthalene is saponified at room temperature, under argon, with a solution of 0.2 mole of sodium hydroxide diluted in 200 cm3 of methanol and 40 cm3 of water.
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