C([O:3][C:4]1(OCC)[CH2:11][C:10]2[C:5]1=[CH:6][C:7]([O:14][CH3:15])=[C:8]([O:12][CH3:13])[CH:9]=2)C.Cl.O>C1COCC1.O>[CH3:13][O:12][C:8]1[CH:9]=[C:10]2[C:5](=[CH:6][C:7]=1[O:14][CH3:15])[C:4](=[O:3])[CH2:11]27,7-Diethoxy-3,4-dimethoxybicyclo[4.2.0]octa-1,3,5-triene (1.76 g, 6.98 mmol) is stirred in a mixture of THF/water (6/1) at ambient temperature. 815 mg of an aqueous 11N HCl solution (1.1 eq, 7.7 mmol) are then added. The reaction mixture is stirred for 2 hours ambient temperature. Water is added to facilitate two extractions with ethyl acetate (2×30 mL). The organic phases are dried over MgSO4 and then subjected to drying. There are obtained 1.01 g of the title product in the form of a grey powder.
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