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The structure of the title compound, (4-benzoyl-2-methyl-phenoxy)-acetic acid ethyl ester (C18H18O4), was established by spectral analysis and X-ray diffraction studies. The compound crystallizes in the orthorhombic space group Pbca with the following unit-cell parameters: a = 36.993(2), b = 10.1567(7), c = 8.3441(6)A, Z = 8. The crystal structure was solved by direct methods using single-crystal X-ray diffraction data collected and refined by full-matrix least-squares procedures to a final R-value of 0.0690 for 2155 observed reflections. The dihedral angle between the benzoyl ring and the methyl substituted phenyl ring is 59.4(1)°. The crystal structure is stabilized by C-H…O and C-H…π hydrogen bonds that link the molecules into infinite chains.

Crystal Structure of (4-Benzoyl-2-methyl-phenoxy)-acetic acid ethyl ester