S(=O)(=O)(O)O.[N+:6]([O-:9])(O)=[O:7].[CH3:10][O:11][C:12](=[O:30])[C:13]([C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][C:17]=1[O:22][CH2:23][C:24]1[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=1)([CH3:15])[CH3:14].C(OCC)(=O)C>C(O)(=O)C>[CH3:10][O:11][C:12](=[O:30])[C:13]([C:16]1[CH:21]=[C:20]([N+:6]([O-:9])=[O:7])[CH:19]=[CH:18][C:17]=1[O:22][CH2:23][C:24]1[CH:25]=[CH:26][CH:27]=[CH:28][CH:29]=1)([CH3:15])[CH3:14]To a mixture of sulfuric acid (0.27 ml) and nitric acid (0.34 ml), a solution of the compound (1.0 g) obtained in Example 561 in acetic acid (30 ml) was added dropwise at 5° C. The reaction mixture was stirred at 45° C. for 4 h, poured into ice cold water and ethyl acetate was added to the mixture. The organic layer was washed with a saturated aqueous sodium bicarbonate solution and a saturated aqueous sodium chloride solution, dried with anhydrous sodium sulfate and the solvent was distilled off under reduced pressure. The resulting residue was purified by silica gel column chromatography (eluent, n-hexane:ethyl acetate=9:1) to give 530 mg of the titled compound (yield, 46%).
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