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- X-ray analysis of 4a: Empirical formula C17H18ClNO2, F.W. 303.77, T = 293 K, monoclinic, space group C2/c, a = 23.677(5)Å, b = 9.5333(2)Å, c = 14.027(3)Å, β = 98.06(3)°, v = 3134.9(11)Å3, Z = 8, Dc = 1.287 Mg/m−3, F(OOO) = 1280, λ (MoK a) = 0.7107 μ =0.247 mm−1, 3.48° < θ < 27.99°, R = 0.0600, wR = 0.1959