data_global _publ_contact_author_email STEVE.DAVIES@CHEM.OX.AC.UK _publ_contact_author_name 'Prof Stephen G Davies' _journal_name_full Org.Biomol.Chem. _journal_coden_Cambridge 0177 _publ_contact_author_address ; Dyson Perrins Laboratory University of Oxford South Parks Road Oxford Oxon OX1 3QY UNITED KINGDOM ; _publ_section_title ; Asymmetric synthesis of the stereoisomers of 2-amino-5-carboxymethyl-cyclopentane-1-carboxylate ; loop_ _publ_author_name 'Stephen G. Davies' 'J.Antonio Casaseca' 'David Diez' 'Sara H. Dominguez' 'Mohamed M. El Hammouni' ; N.M.Garrido ; 'Julio G. Urones' data_testr _database_code_depnum_ccdc_archive 'CCDC 220744' _audit_creation_method SHELXL _chemical_name_systematic ; ? ; _chemical_name_common ? _chemical_formula_moiety ? _chemical_formula_structural ? _chemical_formula_analytical ? _chemical_formula_sum 'C25 H31 N O4' _chemical_formula_weight 409.51 _chemical_melting_point ? _chemical_compound_source ? loop_ _atom_type_symbol _atom_type_description _atom_type_scat_dispersion_real _atom_type_scat_dispersion_imag _atom_type_scat_source C C 0.0181 0.0091 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' N N 0.0311 0.0180 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' O O 0.0492 0.0322 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' H H 0.0000 0.0000 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' _symmetry_cell_setting Orthorhombic _symmetry_space_group_name_H-M P212121 loop_ _symmetry_equiv_pos_as_xyz 'x, y, z' '-x+1/2, -y, z+1/2' '-x, y+1/2, -z+1/2' 'x+1/2, -y+1/2, -z' _cell_length_a 18.0640(10) _cell_length_b 13.9610(10) _cell_length_c 9.1430(10) _cell_angle_alpha 90.00 _cell_angle_beta 90.00 _cell_angle_gamma 90.00 _cell_volume 2305.8(3) _cell_formula_units_Z 4 _cell_measurement_temperature 293(2) _cell_measurement_reflns_used ? _cell_measurement_theta_min ? _cell_measurement_theta_max ? _exptl_crystal_description ? _exptl_crystal_colour ? _exptl_crystal_size_max 1 _exptl_crystal_size_mid 0.8 _exptl_crystal_size_min 0.7 _exptl_crystal_density_meas ? _exptl_crystal_density_diffrn 1.180 _exptl_crystal_density_method ? _exptl_crystal_F_000 880 _exptl_absorpt_coefficient_mu 0.634 _exptl_absorpt_correction_type none _exptl_absorpt_correction_T_min ? _exptl_absorpt_correction_T_max ? _exptl_special_details ; ? ; _diffrn_ambient_temperature 293(2) _diffrn_radiation_wavelength 1.54180 _diffrn_radiation_type CuK\a _diffrn_radiation_source 'fine-focus sealed tube' _diffrn_radiation_monochromator graphite _diffrn_measurement_device 'Seifert XRD 3003 SC' _diffrn_measurement_method 2theta-omega _diffrn_standards_number ? _diffrn_standards_interval_count ? _diffrn_standards_interval_time ? _diffrn_standards_decay_% ? _diffrn_reflns_number 2087 _diffrn_reflns_av_R_equivalents 0.0000 _diffrn_reflns_av_sigmaI/netI 0.0091 _diffrn_reflns_limit_h_min 0 _diffrn_reflns_limit_h_max 21 _diffrn_reflns_limit_k_min 0 _diffrn_reflns_limit_k_max 16 _diffrn_reflns_limit_l_min -1 _diffrn_reflns_limit_l_max 9 _diffrn_reflns_theta_min 4.00 _diffrn_reflns_theta_max 65.35 _reflns_number_total 2087 _reflns_number_observed 1934 _reflns_observed_criterion >2sigma(I) _computing_data_collection CRYSOM _computing_cell_refinement 'Siemens XSCANS' _computing_data_reduction XRAY80 _computing_structure_solution 'Siemens SHELXTL' _computing_structure_refinement 'Siemens SHELXTL' _computing_molecular_graphics 'Siemens SHELXTL' _computing_publication_material 'Siemens SHELXTL' _refine_special_details ; Refinement on F^2^ for ALL reflections except for 0 with very negative F^2^ or flagged by the user for potential systematic errors. Weighted R-factors wR and all goodnesses of fit S are based on F^2^, conventional R-factors R are based on F, with F set to zero for negative F^2^. The observed criterion of F^2^ > 2sigma(F^2^) is used only for calculating #_R_factor_obs etc. and is not relevant to the choice of reflections for refinement. R-factors based on F^2^ are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. ; _refine_ls_structure_factor_coef Fsqd _refine_ls_matrix_type full _refine_ls_weighting_scheme ; calc w=1/[\s^2^(Fo^2^)+(0.0937P)^2^+0.2319P] where P=(Fo^2^+2Fc^2^)/3 ; _atom_sites_solution_primary direct _atom_sites_solution_secondary difmap _atom_sites_solution_hydrogens geom _refine_ls_hydrogen_treatment ? _refine_ls_extinction_method SHELXL _refine_ls_extinction_coef 0.0467(25) _refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^ _refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881' _refine_ls_abs_structure_Flack 0.20(42) _refine_ls_number_reflns 2087 _refine_ls_number_parameters 275 _refine_ls_number_restraints 0 _refine_ls_R_factor_all 0.0483 _refine_ls_R_factor_obs 0.0457 _refine_ls_wR_factor_all 0.1272 _refine_ls_wR_factor_obs 0.1210 _refine_ls_goodness_of_fit_all 1.047 _refine_ls_goodness_of_fit_obs 1.041 _refine_ls_restrained_S_all 1.047 _refine_ls_restrained_S_obs 1.041 _refine_ls_shift/esd_max -0.002 _refine_ls_shift/esd_mean 0.000 loop_ _atom_site_label _atom_site_type_symbol _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv _atom_site_thermal_displace_type _atom_site_occupancy _atom_site_calc_flag _atom_site_refinement_flags _atom_site_disorder_group N1 N 0.08740(11) 0.40194(15) 0.4502(3) 0.0475(5) Uani 1 d . . O1 O 0.19002(14) 0.5239(2) 0.7849(3) 0.0921(9) Uani 1 d . . O2 O 0.0837(2) 0.5975(2) 0.7393(2) 0.0786(7) Uani 1 d . . O3 O 0.22667(13) 0.8338(2) 0.4010(4) 0.0877(9) Uani 1 d . . O4 O 0.34217(11) 0.7802(2) 0.4213(3) 0.0751(7) Uani 1 d . . C1 C 0.08420(14) 0.5065(2) 0.4560(3) 0.0489(6) Uani 1 d . . H1 H 0.04073(14) 0.5238(2) 0.5145(3) 0.059 Uiso 1 calc R . C2 C 0.15274(14) 0.5466(2) 0.5354(3) 0.0482(6) Uani 1 d . . H2 H 0.19447(14) 0.5040(2) 0.5141(3) 0.058 Uiso 1 calc R . C3 C 0.16914(14) 0.6440(2) 0.4634(4) 0.0532(7) Uani 1 d . . H3 H 0.13580(14) 0.6929(2) 0.5030(4) 0.064 Uiso 1 calc R . C4 C 0.1495(2) 0.6240(2) 0.3034(4) 0.0685(9) Uani 1 d . . H4A H 0.1407(2) 0.6832(2) 0.2508(4) 0.082 Uiso 1 calc R . H4B H 0.1890(2) 0.5891(2) 0.2552(4) 0.082 Uiso 1 calc R . C5 C 0.0798(2) 0.5642(2) 0.3107(4) 0.0707(9) Uani 1 d . . H5A H 0.0771(2) 0.5211(2) 0.2277(4) 0.085 Uiso 1 calc R . H5B H 0.0364(2) 0.6050(2) 0.3102(4) 0.085 Uiso 1 calc R . C6 C 0.1454(2) 0.5534(2) 0.6987(4) 0.0565(7) Uani 1 d . . C7 C 0.0711(3) 0.6102(3) 0.8942(4) 0.108(2) Uani 1 d . . H7A H 0.0228(8) 0.6370(24) 0.9095(5) 0.161 Uiso 1 calc R . H7B H 0.1078(12) 0.6526(21) 0.9336(9) 0.161 Uiso 1 calc R . H7C H 0.0743(21) 0.5492(5) 0.9425(7) 0.161 Uiso 1 calc R . C8 C 0.2491(2) 0.6741(2) 0.4871(4) 0.0624(8) Uani 1 d . . H8A H 0.2595(2) 0.6722(2) 0.5911(4) 0.075 Uiso 1 calc R . H8B H 0.2811(2) 0.6275(2) 0.4401(4) 0.075 Uiso 1 calc R . C9 C 0.2685(2) 0.7713(2) 0.4310(4) 0.0593(8) Uani 1 d . . C10 C 0.3697(2) 0.8728(3) 0.3774(6) 0.0955(13) Uani 1 d . . H10A H 0.4225(3) 0.8698(7) 0.3665(39) 0.143 Uiso 1 calc R . H10B H 0.3573(18) 0.9194(6) 0.4506(21) 0.143 Uiso 1 calc R . H10C H 0.3477(16) 0.8907(12) 0.2859(22) 0.143 Uiso 1 calc R . C11 C 0.01535(15) 0.3533(2) 0.4626(3) 0.0540(7) Uani 1 d . . H11 H 0.02549(15) 0.2848(2) 0.4496(3) 0.065 Uiso 1 calc R . C12 C -0.0394(2) 0.3804(4) 0.3421(4) 0.0870(13) Uani 1 d . . H12A H -0.0538(14) 0.4462(8) 0.3536(21) 0.131 Uiso 1 calc R . H12B H -0.0824(8) 0.3402(16) 0.3487(23) 0.131 Uiso 1 calc R . H12C H -0.0164(6) 0.3718(22) 0.2483(4) 0.131 Uiso 1 calc R . C13 C -0.01477(14) 0.3640(2) 0.6168(3) 0.0467(6) Uani 1 d . . C14 C 0.03122(15) 0.3507(2) 0.7344(3) 0.0585(8) Uani 1 d . . H14 H 0.08106(15) 0.3379(2) 0.7181(3) 0.070 Uiso 1 calc R . C15 C 0.0056(2) 0.3559(3) 0.8756(4) 0.0695(9) Uani 1 d . . H15 H 0.0382(2) 0.3469(3) 0.9531(4) 0.083 Uiso 1 calc R . C16 C -0.0683(2) 0.3744(3) 0.9032(4) 0.0715(9) Uani 1 d . . H16 H -0.0859(2) 0.3782(3) 0.9987(4) 0.086 Uiso 1 calc R . C17 C -0.1148(2) 0.3869(3) 0.7874(4) 0.0738(10) Uani 1 d . . H17 H -0.1646(2) 0.3995(3) 0.8042(4) 0.089 Uiso 1 calc R . C18 C -0.0889(2) 0.3813(2) 0.6455(4) 0.0633(8) Uani 1 d . . H18 H -0.1218(2) 0.3893(2) 0.5681(4) 0.076 Uiso 1 calc R . C19 C 0.1351(2) 0.3625(2) 0.3364(3) 0.0600(8) Uani 1 d . . H19A H 0.1776(2) 0.4040(2) 0.3232(3) 0.072 Uiso 1 calc R . H19B H 0.1081(2) 0.3603(2) 0.2447(3) 0.072 Uiso 1 calc R . C20 C 0.1610(2) 0.2635(2) 0.3751(4) 0.0573(7) Uani 1 d . . C21 C 0.2066(2) 0.2489(3) 0.4957(4) 0.0719(9) Uani 1 d . . H21 H 0.2210(2) 0.3012(3) 0.5518(4) 0.086 Uiso 1 calc R . C22 C 0.2306(2) 0.1596(3) 0.5334(6) 0.0891(11) Uani 1 d . . H22 H 0.2612(2) 0.1519(3) 0.6144(6) 0.107 Uiso 1 calc R . C23 C 0.2103(3) 0.0823(3) 0.4540(8) 0.104(2) Uani 1 d . . H23 H 0.2265(3) 0.0217(3) 0.4811(8) 0.125 Uiso 1 calc R . C24 C 0.1666(3) 0.0927(3) 0.3359(7) 0.105(2) Uani 1 d . . H24 H 0.1529(3) 0.0395(3) 0.2811(7) 0.126 Uiso 1 calc R . C25 C 0.1417(2) 0.1839(3) 0.2958(5) 0.0845(11) Uani 1 d . . H25 H 0.1116(2) 0.1907(3) 0.2140(5) 0.101 Uiso 1 calc R . loop_ _atom_site_aniso_label _atom_site_aniso_U_11 _atom_site_aniso_U_22 _atom_site_aniso_U_33 _atom_site_aniso_U_23 _atom_site_aniso_U_13 _atom_site_aniso_U_12 N1 0.0378(10) 0.0543(11) 0.0503(12) -0.0034(11) 0.0074(10) -0.0063(9) O1 0.0754(15) 0.123(2) 0.078(2) 0.026(2) -0.0281(14) 0.0022(15) O2 0.097(2) 0.0833(14) 0.0558(13) -0.0005(12) 0.0062(13) 0.0243(14) O3 0.0660(13) 0.0597(12) 0.137(2) 0.0204(14) 0.030(2) 0.0069(11) O4 0.0487(11) 0.0685(12) 0.108(2) 0.0005(13) 0.0107(13) -0.0120(10) C1 0.0412(12) 0.0553(14) 0.0503(15) 0.0033(13) -0.0059(12) 0.0005(11) C2 0.0377(12) 0.0472(12) 0.059(2) 0.0042(13) -0.0042(13) 0.0035(10) C3 0.0416(13) 0.0482(13) 0.070(2) 0.0099(14) 0.0011(14) 0.0025(10) C4 0.064(2) 0.072(2) 0.070(2) 0.020(2) -0.006(2) -0.006(2) C5 0.068(2) 0.074(2) 0.070(2) 0.020(2) -0.012(2) -0.007(2) C6 0.056(2) 0.0507(14) 0.063(2) 0.0093(14) -0.0121(15) -0.0057(13) C7 0.165(5) 0.100(3) 0.058(2) -0.009(2) 0.022(3) 0.014(3) C8 0.0477(14) 0.0554(14) 0.084(2) 0.008(2) 0.002(2) -0.0041(12) C9 0.0494(14) 0.0531(14) 0.075(2) -0.0046(15) 0.0165(15) -0.0029(13) C10 0.071(2) 0.086(2) 0.129(4) 0.008(3) 0.019(2) -0.031(2) C11 0.0418(13) 0.065(2) 0.055(2) -0.0048(15) 0.0008(13) -0.0109(12) C12 0.057(2) 0.140(4) 0.064(2) 0.000(2) -0.016(2) -0.026(2) C13 0.0350(11) 0.0478(12) 0.057(2) 0.0008(13) 0.0049(12) -0.0035(10) C14 0.0381(13) 0.082(2) 0.055(2) 0.007(2) 0.0037(13) 0.0062(13) C15 0.055(2) 0.095(2) 0.059(2) 0.014(2) 0.002(2) 0.001(2) C16 0.062(2) 0.085(2) 0.068(2) 0.005(2) 0.022(2) 0.000(2) C17 0.044(2) 0.096(2) 0.081(2) 0.005(2) 0.019(2) 0.012(2) C18 0.0385(13) 0.076(2) 0.076(2) 0.003(2) -0.0007(14) 0.0064(14) C19 0.057(2) 0.069(2) 0.054(2) -0.0045(15) 0.0121(14) -0.0046(13) C20 0.0446(13) 0.065(2) 0.062(2) -0.0140(15) 0.0170(15) -0.0070(12) C21 0.057(2) 0.078(2) 0.082(2) -0.016(2) 0.005(2) 0.007(2) C22 0.065(2) 0.098(3) 0.104(3) 0.008(3) 0.017(2) 0.022(2) C23 0.079(3) 0.076(2) 0.157(5) 0.004(3) 0.043(3) 0.012(2) C24 0.093(3) 0.069(2) 0.152(5) -0.041(3) 0.028(3) -0.018(2) C25 0.077(2) 0.081(2) 0.096(3) -0.030(2) 0.005(2) -0.015(2) _geom_special_details ; All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes. ; loop_ _geom_bond_atom_site_label_1 _geom_bond_atom_site_label_2 _geom_bond_distance _geom_bond_site_symmetry_2 _geom_bond_publ_flag N1 C19 1.458(4) . ? N1 C1 1.462(3) . ? N1 C11 1.473(3) . ? O1 C6 1.201(4) . ? O2 C6 1.325(4) . ? O2 C7 1.446(5) . ? O3 C9 1.187(4) . ? O4 C9 1.339(4) . ? O4 C10 1.441(4) . ? C1 C2 1.541(4) . ? C1 C5 1.556(4) . ? C1 H1 0.98 . ? C2 C6 1.502(5) . ? C2 C3 1.539(4) . ? C2 H2 0.98 . ? C3 C8 1.520(4) . ? C3 C4 1.531(5) . ? C3 H3 0.98 . ? C4 C5 1.512(5) . ? C4 H4A 0.97 . ? C4 H4B 0.97 . ? C5 H5A 0.97 . ? C5 H5B 0.97 . ? C7 H7A 0.96 . ? C7 H7B 0.96 . ? C7 H7C 0.96 . ? C8 C9 1.492(4) . ? C8 H8A 0.97 . ? C8 H8B 0.97 . ? C10 H10A 0.96 . ? C10 H10B 0.96 . ? C10 H10C 0.96 . ? C11 C13 1.519(4) . ? C11 C12 1.528(4) . ? C11 H11 0.98 . ? C12 H12A 0.96 . ? C12 H12B 0.96 . ? C12 H12C 0.96 . ? C13 C14 1.371(4) . ? C13 C18 1.387(4) . ? C14 C15 1.373(5) . ? C14 H14 0.93 . ? C15 C16 1.384(5) . ? C15 H15 0.93 . ? C16 C17 1.362(5) . ? C16 H16 0.93 . ? C17 C18 1.381(5) . ? C17 H17 0.93 . ? C18 H18 0.93 . ? C19 C20 1.502(4) . ? C19 H19A 0.97 . ? C19 H19B 0.97 . ? C20 C25 1.372(4) . ? C20 C21 1.391(5) . ? C21 C22 1.365(5) . ? C21 H21 0.93 . ? C22 C23 1.352(7) . ? C22 H22 0.93 . ? C23 C24 1.345(8) . ? C23 H23 0.93 . ? C24 C25 1.399(6) . ? C24 H24 0.93 . ? C25 H25 0.93 . ? loop_ _geom_angle_atom_site_label_1 _geom_angle_atom_site_label_2 _geom_angle_atom_site_label_3 _geom_angle _geom_angle_site_symmetry_1 _geom_angle_site_symmetry_3 _geom_angle_publ_flag C19 N1 C1 115.2(2) . . ? C19 N1 C11 113.7(2) . . ? C1 N1 C11 115.0(2) . . ? C6 O2 C7 117.6(3) . . ? C9 O4 C10 116.4(3) . . ? N1 C1 C2 110.4(2) . . ? N1 C1 C5 119.2(3) . . ? C2 C1 C5 104.7(2) . . ? N1 C1 H1 107.30(14) . . ? C2 C1 H1 107.3(2) . . ? C5 C1 H1 107.3(2) . . ? C6 C2 C3 112.7(2) . . ? C6 C2 C1 114.8(2) . . ? C3 C2 C1 105.9(2) . . ? C6 C2 H2 107.7(2) . . ? C3 C2 H2 107.68(14) . . ? C1 C2 H2 107.68(14) . . ? C8 C3 C4 114.0(3) . . ? C8 C3 C2 111.5(2) . . ? C4 C3 C2 101.7(2) . . ? C8 C3 H3 109.8(2) . . ? C4 C3 H3 109.8(2) . . ? C2 C3 H3 109.79(14) . . ? C5 C4 C3 104.6(3) . . ? C5 C4 H4A 110.8(2) . . ? C3 C4 H4A 110.8(2) . . ? C5 C4 H4B 110.8(2) . . ? C3 C4 H4B 110.8(2) . . ? H4A C4 H4B 108.9 . . ? C4 C5 C1 106.3(3) . . ? C4 C5 H5A 110.5(2) . . ? C1 C5 H5A 110.5(2) . . ? C4 C5 H5B 110.5(2) . . ? C1 C5 H5B 110.5(2) . . ? H5A C5 H5B 108.7 . . ? O1 C6 O2 122.7(3) . . ? O1 C6 C2 124.9(3) . . ? O2 C6 C2 112.5(2) . . ? O2 C7 H7A 109.5(3) . . ? O2 C7 H7B 109.5(3) . . ? H7A C7 H7B 109.5 . . ? O2 C7 H7C 109.5(2) . . ? H7A C7 H7C 109.5 . . ? H7B C7 H7C 109.5 . . ? C9 C8 C3 115.2(3) . . ? C9 C8 H8A 108.5(2) . . ? C3 C8 H8A 108.5(2) . . ? C9 C8 H8B 108.5(2) . . ? C3 C8 H8B 108.5(2) . . ? H8A C8 H8B 107.5 . . ? O3 C9 O4 123.3(3) . . ? O3 C9 C8 126.8(3) . . ? O4 C9 C8 110.0(3) . . ? O4 C10 H10A 109.5(2) . . ? O4 C10 H10B 109.5(2) . . ? H10A C10 H10B 109.5 . . ? O4 C10 H10C 109.5(2) . . ? H10A C10 H10C 109.5 . . ? H10B C10 H10C 109.5 . . ? N1 C11 C13 110.0(2) . . ? N1 C11 C12 113.7(3) . . ? C13 C11 C12 114.4(3) . . ? N1 C11 H11 106.0(2) . . ? C13 C11 H11 106.0(2) . . ? C12 C11 H11 106.0(2) . . ? C11 C12 H12A 109.5(2) . . ? C11 C12 H12B 109.5(2) . . ? H12A C12 H12B 109.5 . . ? C11 C12 H12C 109.5(2) . . ? H12A C12 H12C 109.5 . . ? H12B C12 H12C 109.5 . . ? C14 C13 C18 117.4(3) . . ? C14 C13 C11 119.8(2) . . ? C18 C13 C11 122.6(3) . . ? C13 C14 C15 121.7(3) . . ? C13 C14 H14 119.1(2) . . ? C15 C14 H14 119.1(2) . . ? C14 C15 C16 120.5(3) . . ? C14 C15 H15 119.8(2) . . ? C16 C15 H15 119.8(2) . . ? C17 C16 C15 118.5(3) . . ? C17 C16 H16 120.8(2) . . ? C15 C16 H16 120.8(2) . . ? C16 C17 C18 121.0(3) . . ? C16 C17 H17 119.5(2) . . ? C18 C17 H17 119.5(2) . . ? C17 C18 C13 120.9(3) . . ? C17 C18 H18 119.5(2) . . ? C13 C18 H18 119.5(2) . . ? N1 C19 C20 111.3(2) . . ? N1 C19 H19A 109.37(15) . . ? C20 C19 H19A 109.4(2) . . ? N1 C19 H19B 109.4(2) . . ? C20 C19 H19B 109.4(2) . . ? H19A C19 H19B 108.0 . . ? C25 C20 C21 116.8(3) . . ? C25 C20 C19 122.8(3) . . ? C21 C20 C19 120.4(3) . . ? C22 C21 C20 121.5(4) . . ? C22 C21 H21 119.2(3) . . ? C20 C21 H21 119.2(2) . . ? C23 C22 C21 120.4(5) . . ? C23 C22 H22 119.8(3) . . ? C21 C22 H22 119.8(3) . . ? C24 C23 C22 120.3(4) . . ? C24 C23 H23 119.8(3) . . ? C22 C23 H23 119.8(3) . . ? C23 C24 C25 119.8(4) . . ? C23 C24 H24 120.1(3) . . ? C25 C24 H24 120.1(3) . . ? C20 C25 C24 121.1(4) . . ? C20 C25 H25 119.4(2) . . ? C24 C25 H25 119.4(3) . . ? _refine_diff_density_max 0.153 _refine_diff_density_min -0.209 _refine_diff_density_rms 0.051