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- X-ray crystallography for 3d: Empirical formula C23H22BrNO, F.W. 408.33, T = 297(2) K, Monoclinic, space group C2/c, a = 1.9687(4) nm, b = 1.3571(2) nm, c = 1.7311(3) nm, α = 90°, β = 118.740(10)°, γ = 90°, V = 4.0553(12) nm3, Z = 8, Dc = 1.338 Mg/m3, λ(M O Kα) = 0.071073 nm, μ = 2.038 mm−1, F(000) = 1680. 1.91°<θ<25.00°, R = 0.0539, wR = 0.1369, S = 0.831, Largest diff. Peak and hole: 812 and − 313 e ċ nm−3.