The crystal of the title compound 6 has been prepared and determined by X-ray diffraction analysis. It belongs to the orthorhombic system, space group P2(1)2(1)2(1) with a = 10.195 (2), b = 11.955(2), c = 14.335(3) Angstrom, C16H21BrO7, M-r = 405.24, V = 1747.0(6) Angstrom(3), Z = 4, D-c = 1.541 g/cm(3), mu = 2.387 mm(-1), F(000) = 832, R = 0.0266 and wR = 0.0348 for 2110 observed reflections with I > 2sigma(I). The crystal exhibits a characteristic spiral structure consisting of one cyclopropane and two butyrolactones with envelope configuration. The intermolecular hydrogen bond between C(16)-H(16)...O(1) and C(3)-H(3)...O(2) has been observed in the crystal lattice.