cqvip:The crystal structure of the new title compound 2-ethoxy-3-n-butyl- benzofuro[2,3-d]pyrimidin-4(3H)-one (C16H18N2O3, Mr = 286.32) has been prepared and determined by single- crystal X-ray diffraction. The crystal is of monoclinic, space group P21/c with a = 13.7167(14), b = 13.113(1), c = 8.378(1) , β = 98.992(2)°, V = 1488.4(3) 3, Z = 4, Dc = 1.278, F(000) = 608, μ = 0.089 mm-1, MoKa radiation (λ = 0.71073), R = 0.0498, wR = 0.1238 for 2336 observed reflections with I > 2σ(I). X-ray diffraction analysis reveals that all ring atoms in the benzo[4, 5]furo [2,3-d] pyrimi- dinone moieties are almost coplanar.
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