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<正> C23H18, Mr = 294. 40, orthorhombic, Pbca, a = 20. 927(9), b = 20. 695(9), c = 7. 570(2)(?), V = 3278(2)(?)3, Z = 8, Dc=1.19gcm-3, μ(MoKα) = 0. 63cm-1, F(000) = 1248, R = 0. 057 for 1109 observed reflections with I>2. 5* (I). The dihedral angl