# Electronic Supplementary Material (ESI) for Chemical Communications # This journal is © The Royal Society of Chemistry 2013 ####################################################################### # # Cambridge Crystallographic Data Centre # CCDC # ####################################################################### # # This CIF contains data from an original supplementary publication # deposited with the CCDC, and may include chemical, crystal, # experimental, refinement, atomic coordinates, # anisotropic displacement parameters and molecular geometry data, # as required by the journal to which it was submitted. # # This CIF is provided on the understanding that it is used for bona # fide research purposes only. It may contain copyright material # of the CCDC or of third parties, and may not be copied or further # disseminated in any form, whether machine-readable or not, # except for the purpose of generating routine backup copies # on your local computer system. # # For further information on the CCDC, data deposition and # data retrieval see: # www.ccdc.cam.ac.uk # # Bona fide researchers may freely download Mercury and enCIFer # from this site to visualise CIF-encoded structures and # to carry out CIF format checking respectively. # data_mee #TrackingRef 'web_deposit_cif_file_0_SayantiChatterjee_1366610117.mee_new.cif' _audit_creation_method SHELXL-97 _chemical_name_systematic ; ? ; _chemical_name_common ? _chemical_melting_point ? _chemical_formula_moiety ? _chemical_formula_sum 'C19 H27 Cl2 Fe N4 O2' _chemical_formula_weight 470.20 loop_ _atom_type_symbol _atom_type_description _atom_type_scat_dispersion_real _atom_type_scat_dispersion_imag _atom_type_scat_source C C 0.0033 0.0016 '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' N N 0.0061 0.0033 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' O O 0.0106 0.0060 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' Cl Cl 0.1484 0.1585 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' Fe Fe 0.3463 0.8444 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' _symmetry_cell_setting Monoclinic _symmetry_space_group_name_H-M Cc loop_ _symmetry_equiv_pos_as_xyz 'x, y, z' 'x, -y, z+1/2' 'x+1/2, y+1/2, z' 'x+1/2, -y+1/2, z+1/2' _cell_length_a 13.3894(8) _cell_length_b 14.7280(9) _cell_length_c 10.9907(7) _cell_angle_alpha 90.00 _cell_angle_beta 96.691(2) _cell_angle_gamma 90.00 _cell_volume 2152.6(2) _cell_formula_units_Z 4 _cell_measurement_temperature 120(2) _cell_measurement_reflns_used 9890 _cell_measurement_theta_min 2.66 _cell_measurement_theta_max 30.64 _exptl_crystal_description block _exptl_crystal_colour yellow _exptl_crystal_size_max 0.10 _exptl_crystal_size_mid 0.08 _exptl_crystal_size_min 0.06 _exptl_crystal_density_meas ? _exptl_crystal_density_diffrn 1.451 _exptl_crystal_density_method 'not measured' _exptl_crystal_F_000 980 _exptl_absorpt_coefficient_mu 0.971 _exptl_absorpt_correction_type Multi-scan _exptl_absorpt_correction_T_min 0.9092 _exptl_absorpt_correction_T_max 0.9440 _exptl_absorpt_process_details Sadabs _exptl_special_details ; ? ; _diffrn_ambient_temperature 120(2) _diffrn_radiation_wavelength 0.71073 _diffrn_radiation_type MoK\a _diffrn_radiation_source 'fine-focus sealed tube' _diffrn_radiation_monochromator graphite _diffrn_measurement_device_type 'Bruker APEX-II CCD' _diffrn_measurement_method 'Phi and omega scan' _diffrn_detector_area_resol_mean ? _diffrn_standards_number ? _diffrn_standards_interval_count ? _diffrn_standards_interval_time ? _diffrn_standards_decay_% ? _diffrn_reflns_number 12356 _diffrn_reflns_av_R_equivalents 0.0175 _diffrn_reflns_av_sigmaI/netI 0.0259 _diffrn_reflns_limit_h_min -15 _diffrn_reflns_limit_h_max 15 _diffrn_reflns_limit_k_min -17 _diffrn_reflns_limit_k_max 17 _diffrn_reflns_limit_l_min -13 _diffrn_reflns_limit_l_max 12 _diffrn_reflns_theta_min 2.06 _diffrn_reflns_theta_max 24.99 _reflns_number_total 3507 _reflns_number_gt 3408 _reflns_threshold_expression >2sigma(I) _computing_data_collection 'Bruker APEX2' _computing_cell_refinement 'Bruker SAINT' _computing_data_reduction 'Bruker SAINT' _computing_structure_solution 'SHELXS-97 (Sheldrick, 1990)' _computing_structure_refinement 'SHELXL-97 (Sheldrick, 1997)' _computing_molecular_graphics 'Bruker SHELXTL' _computing_publication_material Ortep _refine_special_details ; Refinement of F^2^ against ALL reflections. The weighted R-factor wR and goodness 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 threshold expression of F^2^ > 2sigma(F^2^) is used only for calculating R-factors(gt) 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 _refine_ls_weighting_details 'calc w=1/[\s^2^(Fo^2^)+(0.0536P)^2^+0.0000P] 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 mixed _refine_ls_extinction_method none _refine_ls_extinction_coef ? _refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881' _refine_ls_abs_structure_Flack 0.012(13) _refine_ls_number_reflns 3507 _refine_ls_number_parameters 263 _refine_ls_number_restraints 2 _refine_ls_R_factor_all 0.0231 _refine_ls_R_factor_gt 0.0205 _refine_ls_wR_factor_ref 0.0786 _refine_ls_wR_factor_gt 0.0630 _refine_ls_goodness_of_fit_ref 1.181 _refine_ls_restrained_S_all 1.180 _refine_ls_shift/su_max 0.001 _refine_ls_shift/su_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_adp_type _atom_site_occupancy _atom_site_symmetry_multiplicity _atom_site_calc_flag _atom_site_refinement_flags _atom_site_disorder_assembly _atom_site_disorder_group Fe1 Fe 0.45998(2) 0.62340(2) 0.58011(3) 0.01002(11) Uani 1 1 d . . . Cl2 Cl 0.61991(5) 0.62632(4) 0.69661(6) 0.01729(17) Uani 1 1 d . . . Cl1 Cl 0.37876(5) 0.54739(4) 0.74738(6) 0.01832(16) Uani 1 1 d . . . C7 C 0.3103(2) 0.71627(16) 0.4030(2) 0.0113(5) Uani 1 1 d . . . H7 H 0.2493 0.7292 0.3472 0.014 Uiso 1 1 calc R . . N2 N 0.48698(17) 0.68751(14) 0.39226(19) 0.0114(4) Uani 1 1 d . . . N4 N 0.21692(19) 0.49860(14) 0.4925(2) 0.0109(4) Uani 1 1 d . . . C8 C 0.4035(2) 0.72916(17) 0.3383(2) 0.0111(5) Uani 1 1 d . . . O1 O 0.15781(15) 0.64281(12) 0.51615(18) 0.0167(4) Uani 1 1 d . . . N1 N 0.38260(17) 0.75495(14) 0.6090(2) 0.0107(4) Uani 1 1 d . . . C3 C 0.3496(2) 0.89656(19) 0.7021(3) 0.0163(6) Uani 1 1 d . . . H3 H 0.3620 0.9360 0.7683 0.020 Uiso 1 1 calc R . . C5 C 0.2680(2) 0.86262(18) 0.5036(3) 0.0149(6) Uani 1 1 d . . . H5 H 0.2240 0.8773 0.4346 0.018 Uiso 1 1 calc R . . C2 C 0.3963(2) 0.81201(18) 0.7057(2) 0.0132(6) Uani 1 1 d . . . C16 C 0.0401(2) 0.4487(2) 0.4596(3) 0.0200(6) Uani 1 1 d . . . H16A H 0.0503 0.4253 0.3804 0.030 Uiso 1 1 calc R . . H16B H 0.0178 0.5106 0.4516 0.030 Uiso 1 1 calc R . . H16C H -0.0098 0.4129 0.4935 0.030 Uiso 1 1 calc R . . C6 C 0.3189(2) 0.78035(17) 0.5119(2) 0.0106(5) Uani 1 1 d . . . C14 C 0.22088(19) 0.58965(17) 0.4877(2) 0.0100(5) Uani 1 1 d . . . C13 C 0.6620(2) 0.6409(2) 0.3902(3) 0.0195(6) Uani 1 1 d . . . H13A H 0.6558 0.5799 0.3595 0.029 Uiso 1 1 calc R . . H13B H 0.6655 0.6401 0.4780 0.029 Uiso 1 1 calc R . . H13C H 0.7220 0.6679 0.3665 0.029 Uiso 1 1 calc R . . C10 C 0.4902(2) 0.79319(17) 0.1828(3) 0.0164(6) Uani 1 1 d . . . H10 H 0.4921 0.8295 0.1138 0.020 Uiso 1 1 calc R . . C11 C 0.5764(2) 0.74943(19) 0.2353(2) 0.0160(6) Uani 1 1 d . . . H11 H 0.6366 0.7563 0.2018 0.019 Uiso 1 1 calc R . . C18 C 0.1807(2) 0.3474(2) 0.5508(3) 0.0244(7) Uani 1 1 d . . . H18A H 0.2435 0.3465 0.6027 0.037 Uiso 1 1 calc R . . H18B H 0.1910 0.3274 0.4701 0.037 Uiso 1 1 calc R . . H18C H 0.1337 0.3077 0.5838 0.037 Uiso 1 1 calc R . . C12 C 0.5725(2) 0.69518(17) 0.3384(2) 0.0135(6) Uani 1 1 d . . . C1 C 0.4612(2) 0.78145(19) 0.8183(3) 0.0197(6) Uani 1 1 d . . . H1A H 0.5283 0.7710 0.7989 0.030 Uiso 1 1 calc R . . H1B H 0.4347 0.7262 0.8480 0.030 Uiso 1 1 calc R . . H1C H 0.4624 0.8275 0.8803 0.030 Uiso 1 1 calc R . . C15 C 0.1388(2) 0.44433(18) 0.5442(3) 0.0138(6) Uani 1 1 d . . . C17 C 0.1227(2) 0.4768(2) 0.6718(3) 0.0194(6) Uani 1 1 d . . . H17A H 0.0925 0.5360 0.6665 0.029 Uiso 1 1 calc R . . H17B H 0.1863 0.4797 0.7220 0.029 Uiso 1 1 calc R . . H17C H 0.0793 0.4351 0.7075 0.029 Uiso 1 1 calc R . . C4 C 0.2850(2) 0.92208(18) 0.6012(3) 0.0153(6) Uani 1 1 d . . . H4 H 0.2533 0.9784 0.5987 0.018 Uiso 1 1 calc R . . C9 C 0.4012(2) 0.78204(17) 0.2344(2) 0.0145(6) Uani 1 1 d . . . H9 H 0.3419 0.8093 0.2000 0.017 Uiso 1 1 calc R . . N3 N 0.31128(19) 0.62063(13) 0.4443(2) 0.0109(5) Uani 1 1 d . . . H3A H 0.3225 0.5852 0.3795 0.013 Uiso 1 1 calc R . . H4U H 0.263(3) 0.4699(19) 0.469(3) 0.004(7) Uiso 1 1 d . . . O2 O 0.49374(17) 0.49887(12) 0.49309(18) 0.0205(4) Uani 1 1 d . . . C19 C 0.5085(2) 0.41437(18) 0.5580(3) 0.0194(6) Uani 1 1 d . . . H19A H 0.4444 0.3886 0.5693 0.029 Uiso 1 1 calc R . . H19B H 0.5462 0.4250 0.6365 0.029 Uiso 1 1 calc R . . H19C H 0.5449 0.3732 0.5117 0.029 Uiso 1 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 Fe1 0.0111(2) 0.01096(18) 0.00734(19) 0.00103(14) -0.00174(13) -0.00091(14) Cl2 0.0145(4) 0.0224(4) 0.0137(4) -0.0013(2) -0.0039(3) -0.0022(3) Cl1 0.0196(4) 0.0239(3) 0.0104(3) 0.0058(2) -0.0028(2) -0.0067(3) C7 0.0125(14) 0.0118(12) 0.0089(12) 0.0014(9) -0.0020(10) -0.0008(10) N2 0.0139(12) 0.0109(10) 0.0096(11) -0.0023(8) 0.0014(9) -0.0026(9) N4 0.0105(11) 0.0134(10) 0.0091(11) -0.0006(8) 0.0023(9) -0.0019(10) C8 0.0147(14) 0.0095(11) 0.0087(12) -0.0035(9) 0.0000(10) -0.0048(10) O1 0.0174(11) 0.0160(9) 0.0179(11) -0.0014(8) 0.0066(8) -0.0001(9) N1 0.0115(11) 0.0113(10) 0.0093(11) 0.0012(8) 0.0011(8) -0.0017(9) C3 0.0183(15) 0.0172(13) 0.0142(14) -0.0052(10) 0.0055(11) -0.0042(12) C5 0.0130(15) 0.0172(13) 0.0142(14) 0.0018(10) 0.0002(11) 0.0020(11) C2 0.0128(14) 0.0177(13) 0.0093(13) -0.0008(10) 0.0020(10) -0.0031(11) C16 0.0162(15) 0.0266(15) 0.0170(14) 0.0013(11) 0.0013(11) -0.0092(12) C6 0.0093(13) 0.0143(12) 0.0083(12) 0.0012(9) 0.0013(10) -0.0033(10) C14 0.0106(13) 0.0162(12) 0.0025(11) -0.0005(9) -0.0018(9) -0.0018(11) C13 0.0154(16) 0.0234(13) 0.0204(16) -0.0003(12) 0.0057(12) 0.0030(12) C10 0.0250(16) 0.0152(12) 0.0096(13) -0.0009(10) 0.0043(11) -0.0075(12) C11 0.0199(15) 0.0193(13) 0.0093(13) -0.0038(10) 0.0042(11) -0.0071(11) C18 0.0260(18) 0.0160(14) 0.0315(18) 0.0046(13) 0.0056(14) -0.0045(13) C12 0.0143(15) 0.0142(12) 0.0119(13) -0.0071(10) 0.0014(11) -0.0030(11) C1 0.0269(17) 0.0186(14) 0.0121(14) -0.0035(10) -0.0039(12) 0.0006(11) C15 0.0145(15) 0.0129(12) 0.0137(13) 0.0015(10) 0.0008(10) -0.0059(11) C17 0.0211(15) 0.0249(14) 0.0120(13) 0.0014(11) 0.0011(11) -0.0093(12) C4 0.0157(15) 0.0113(13) 0.0196(15) 0.0002(11) 0.0056(11) 0.0022(11) C9 0.0187(15) 0.0130(13) 0.0109(13) -0.0012(10) -0.0016(11) -0.0026(11) N3 0.0120(13) 0.0097(11) 0.0112(12) 0.0011(8) 0.0014(9) -0.0027(8) O2 0.0321(12) 0.0109(9) 0.0165(10) -0.0008(7) -0.0050(8) 0.0020(8) C19 0.0257(17) 0.0140(14) 0.0167(14) 0.0032(11) -0.0048(12) 0.0023(12) _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 Fe1 O2 2.1410(19) . ? Fe1 N1 2.237(2) . ? Fe1 N2 2.336(2) . ? Fe1 N3 2.345(3) . ? Fe1 Cl2 2.3640(7) . ? Fe1 Cl1 2.5063(7) . ? C7 N3 1.480(3) . ? C7 C6 1.519(3) . ? C7 C8 1.519(4) . ? C7 H7 0.9800 . ? N2 C8 1.350(3) . ? N2 C12 1.354(3) . ? N4 C14 1.343(3) . ? N4 C15 1.481(3) . ? N4 H4U 0.82(3) . ? C8 C9 1.380(4) . ? O1 C14 1.219(3) . ? N1 C6 1.339(4) . ? N1 C2 1.350(4) . ? C3 C4 1.377(4) . ? C3 C2 1.392(4) . ? C3 H3 0.9300 . ? C5 C4 1.383(4) . ? C5 C6 1.388(4) . ? C5 H5 0.9300 . ? C2 C1 1.497(4) . ? C16 C15 1.525(4) . ? C16 H16A 0.9600 . ? C16 H16B 0.9600 . ? C16 H16C 0.9600 . ? C14 N3 1.426(4) . ? C13 C12 1.496(4) . ? C13 H13A 0.9600 . ? C13 H13B 0.9600 . ? C13 H13C 0.9600 . ? C10 C11 1.388(4) . ? C10 C9 1.388(4) . ? C10 H10 0.9300 . ? C11 C12 1.392(4) . ? C11 H11 0.9300 . ? C18 C15 1.532(4) . ? C18 H18A 0.9600 . ? C18 H18B 0.9600 . ? C18 H18C 0.9600 . ? C1 H1A 0.9600 . ? C1 H1B 0.9600 . ? C1 H1C 0.9600 . ? C15 C17 1.521(4) . ? C17 H17A 0.9600 . ? C17 H17B 0.9600 . ? C17 H17C 0.9600 . ? C4 H4 0.9300 . ? C9 H9 0.9300 . ? N3 H3A 0.9100 . ? O2 C19 1.437(3) . ? C19 H19A 0.9600 . ? C19 H19B 0.9600 . ? C19 H19C 0.9600 . ? 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 O2 Fe1 N1 158.56(9) . . ? O2 Fe1 N2 83.62(7) . . ? N1 Fe1 N2 84.12(8) . . ? O2 Fe1 N3 84.75(8) . . ? N1 Fe1 N3 74.50(8) . . ? N2 Fe1 N3 69.64(8) . . ? O2 Fe1 Cl2 91.86(6) . . ? N1 Fe1 Cl2 108.22(6) . . ? N2 Fe1 Cl2 104.34(6) . . ? N3 Fe1 Cl2 173.35(6) . . ? O2 Fe1 Cl1 94.43(6) . . ? N1 Fe1 Cl1 92.00(6) . . ? N2 Fe1 Cl1 162.51(6) . . ? N3 Fe1 Cl1 92.88(6) . . ? Cl2 Fe1 Cl1 93.09(3) . . ? N3 C7 C6 110.6(2) . . ? N3 C7 C8 106.5(2) . . ? C6 C7 C8 107.5(2) . . ? N3 C7 H7 110.7 . . ? C6 C7 H7 110.7 . . ? C8 C7 H7 110.7 . . ? C8 N2 C12 118.0(2) . . ? C8 N2 Fe1 111.49(16) . . ? C12 N2 Fe1 130.25(18) . . ? C14 N4 C15 125.9(2) . . ? C14 N4 H4U 118(2) . . ? C15 N4 H4U 116(2) . . ? N2 C8 C9 123.9(2) . . ? N2 C8 C7 114.9(2) . . ? C9 C8 C7 121.1(2) . . ? C6 N1 C2 117.9(2) . . ? C6 N1 Fe1 113.02(16) . . ? C2 N1 Fe1 128.92(19) . . ? C4 C3 C2 120.3(3) . . ? C4 C3 H3 119.8 . . ? C2 C3 H3 119.8 . . ? C4 C5 C6 117.8(3) . . ? C4 C5 H5 121.1 . . ? C6 C5 H5 121.1 . . ? N1 C2 C3 121.0(3) . . ? N1 C2 C1 118.4(2) . . ? C3 C2 C1 120.6(2) . . ? C15 C16 H16A 109.5 . . ? C15 C16 H16B 109.5 . . ? H16A C16 H16B 109.5 . . ? C15 C16 H16C 109.5 . . ? H16A C16 H16C 109.5 . . ? H16B C16 H16C 109.5 . . ? N1 C6 C5 124.0(2) . . ? N1 C6 C7 115.9(2) . . ? C5 C6 C7 119.9(2) . . ? O1 C14 N4 126.8(3) . . ? O1 C14 N3 121.4(2) . . ? N4 C14 N3 111.8(2) . . ? C12 C13 H13A 109.5 . . ? C12 C13 H13B 109.5 . . ? H13A C13 H13B 109.5 . . ? C12 C13 H13C 109.5 . . ? H13A C13 H13C 109.5 . . ? H13B C13 H13C 109.5 . . ? C11 C10 C9 119.2(3) . . ? C11 C10 H10 120.4 . . ? C9 C10 H10 120.4 . . ? C10 C11 C12 119.8(3) . . ? C10 C11 H11 120.1 . . ? C12 C11 H11 120.1 . . ? C15 C18 H18A 109.5 . . ? C15 C18 H18B 109.5 . . ? H18A C18 H18B 109.5 . . ? C15 C18 H18C 109.5 . . ? H18A C18 H18C 109.5 . . ? H18B C18 H18C 109.5 . . ? N2 C12 C11 121.2(3) . . ? N2 C12 C13 118.0(2) . . ? C11 C12 C13 120.8(2) . . ? C2 C1 H1A 109.5 . . ? C2 C1 H1B 109.5 . . ? H1A C1 H1B 109.5 . . ? C2 C1 H1C 109.5 . . ? H1A C1 H1C 109.5 . . ? H1B C1 H1C 109.5 . . ? N4 C15 C17 111.5(2) . . ? N4 C15 C16 110.1(2) . . ? C17 C15 C16 110.1(2) . . ? N4 C15 C18 104.5(2) . . ? C17 C15 C18 109.8(2) . . ? C16 C15 C18 110.8(2) . . ? C15 C17 H17A 109.5 . . ? C15 C17 H17B 109.5 . . ? H17A C17 H17B 109.5 . . ? C15 C17 H17C 109.5 . . ? H17A C17 H17C 109.5 . . ? H17B C17 H17C 109.5 . . ? C3 C4 C5 118.9(3) . . ? C3 C4 H4 120.5 . . ? C5 C4 H4 120.5 . . ? C8 C9 C10 117.9(3) . . ? C8 C9 H9 121.1 . . ? C10 C9 H9 121.1 . . ? C14 N3 C7 115.4(2) . . ? C14 N3 Fe1 118.91(17) . . ? C7 N3 Fe1 98.94(16) . . ? C14 N3 H3A 107.6 . . ? C7 N3 H3A 107.6 . . ? Fe1 N3 H3A 107.6 . . ? C19 O2 Fe1 122.96(16) . . ? O2 C19 H19A 109.5 . . ? O2 C19 H19B 109.5 . . ? H19A C19 H19B 109.5 . . ? O2 C19 H19C 109.5 . . ? H19A C19 H19C 109.5 . . ? H19B C19 H19C 109.5 . . ? _diffrn_measured_fraction_theta_max 0.999 _diffrn_reflns_theta_full 24.99 _diffrn_measured_fraction_theta_full 0.999 _refine_diff_density_max 0.386 _refine_diff_density_min -0.451 _refine_diff_density_rms 0.150 _database_code_depnum_ccdc_archive 'CCDC 915749'