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- 1994 . Univ. Oxford . Crystal data for compound 2d: Colourless crystals, C16H23NO2 (M=261.36 gmol−1), crystallized in the orthorrombic space group P 21 21 21 a=8.390(4), b=10.404(5), c=17.467(4) Å, V=1524(l) Å, 3 Z=4, pCalcd= 0.70 Mgm.−3 A total of 1572 reflections was measured of which 1551 were independent, absorption correction: DIFABS (min: 0.82, max: 1.20), corrections were made for Lorentz and polarization effects. Solution and refinement: direct methods (SHELXS-86) for structure solution. Nonhydrogen atoms were refined anisotropically, hydrogen atoms were found by difference Fourier maps and refined with an overall isotropic thermal parameter, least squares refinements were carried out by minimizing the function w(lF0l-lFcl)2 where F0 and Fc are the observed and calculated structure factors. Unit weight was used. Models reached convergence with R=Z(llF0l-lFcll)/lF0l and Rw=[(lF0l-lFcl)2/w(F0)2]12 with values R=0.040, Rw=0.037 from 847 reflections with F3(F) for 173 variables against /F/, w=1.0, s=1.87. Largest residual electron density peak / hole in the final difference map: pmax=0.18, pmin= -0.36 e - / Å3 (CRYSTALS, Program for Refinement of Crystal Structures, D. J. Watkin, J. R. Caruthers, P.V. Betteridge version 9)