[CH2:1]([O:3][C:4](=[O:16])[C:5](=[CH2:15])[CH2:6][CH2:7][CH2:8][CH2:9][CH2:10][CH2:11][CH:12]1[CH2:14][CH2:13]1)[CH3:2].ClC1C=CC=C(C(OO)=[O:25])C=1>C(Cl)Cl>[CH2:1]([O:3][C:4]([C:5]1([CH2:6][CH2:7][CH2:8][CH2:9][CH2:10][CH2:11][CH:12]2[CH2:13][CH2:14]2)[CH2:15][O:25]1)=[O:16])[CH3:2]1.18 g of the title compound, in the form of a yellowish oil, which is purified by chromatography on silica gel (migrating agent: 90:10 petroleum ether/ethyl acetate), are obtained by the procedure described in Example (1a) from 2.5 g of 8-cyclopropyl-2-methyleneoctanoic acid ethyl ester and 3.85 g of m-chloroperbenzoic acid in 30 ml of methylene chloride.
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