[C:1]([O:9][CH:10]([C:18](=[O:21])[CH2:19][CH3:20])[C:11](=[O:17])[CH:12]=[CH:13]N(C)C)(=[O:8])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C(O)(=O)CC.C(O)(=O)C(O)=O.Cl.S(=O)(=O)(O)O>C(O)(=O)C.C(O)=O>[C:1]([O:9][C:10]1[C:18](=[O:21])[CH:19]=[CH:20][O:17][C:11]=1[CH2:12][CH3:13])(=[O:8])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1said 4-benzoyloxy-1-dimethylamino-1-heptene-3,5-dione is heated in an acid chosen from the group consisting of formic acid, acetic acid, propionic acid, oxalic acid, dilute hydrochloric acid and dilute sulfuric acid to form 3-benzoyloxy-2-ethyl-4-pyrone, and,
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