# Supplementary Material (ESI) for Organic & Biomolecular Chemistry # This journal is (c) The Royal Society of Chemistry 2009 data_global _journal_coden_Cambridge 177 loop_ _publ_author_name 'Hansjoerg Streicher' 'Benoit Carbain' 'Patrick J. Collins' 'Stephen Martin' _publ_contact_author_name 'Hansjoerg Streicher' _publ_contact_author_email H.STREICHER@SUSSEX.AC.UK _publ_section_title ; Galactose-Conjugates of the Oseltamivir Pharmacophore - New Tools for the Characterization of Influenza Virus Neuraminidases ; _publ_requested_category FO # Attachment 'iodine.cif' data_dec707 _database_code_depnum_ccdc_archive 'CCDC 720847' _audit_creation_date 2007-12-10T09:33:08-00:00 _audit_creation_method 'WinGX routine CIF_UPDATE' _audit_conform_dict_name cif_core.dic _audit_conform_dict_version 2.2 _audit_conform_dict_location ftp://ftp.iucr.org/pub/cif_core.dic #----------------------------------------------------------------------------# # CHEMICAL INFORMATION # #----------------------------------------------------------------------------# _chemical_name_systematic ; ? ; _chemical_formula_moiety 'C18 H31 I N2 O4' _chemical_formula_sum 'C18 H31 I N2 O4' _chemical_formula_weight 466.35 _chemical_compound_source 'synthesis as described' _chemical_absolute_configuration ad #----------------------------------------------------------------------------# # UNIT CELL INFORMATION # #----------------------------------------------------------------------------# _symmetry_cell_setting monoclinic _symmetry_space_group_name_H-M 'P 21' _symmetry_space_group_name_Hall 'P 2yb' _symmetry_Int_Tables_number 4 loop_ _symmetry_equiv_pos_as_xyz 'x, y, z' '-x, y+1/2, -z' _cell_length_a 12.2334(15) _cell_length_b 4.9607(6) _cell_length_c 18.6244(19) _cell_angle_alpha 90 _cell_angle_beta 105.910(7) _cell_angle_gamma 90 _cell_volume 1086.9(2) _cell_formula_units_Z 2 _cell_measurement_temperature 173(2) _cell_measurement_reflns_used 30758 _cell_measurement_theta_min 3.395 _cell_measurement_theta_max 26.022 _cell_measurement_wavelength 0.71073 #----------------------------------------------------------------------------# # CRYSTAL INFORMATION # #----------------------------------------------------------------------------# _exptl_crystal_description needle _exptl_crystal_colour colourless _exptl_crystal_size_max 0.3 _exptl_crystal_size_mid 0.02 _exptl_crystal_size_min 0.01 _exptl_crystal_density_diffrn 1.425 _exptl_crystal_density_method 'not measured' _exptl_crystal_F_000 476 _exptl_special_details ; ? ; #----------------------------------------------------------------------------# # ABSORPTION CORRECTION # #----------------------------------------------------------------------------# _exptl_absorpt_coefficient_mu 1.495 _exptl_absorpt_correction_type multi-scan _exptl_absorpt_process_details ; [c.f. r.h. blessing, acta cryst. (1995), a51, 33-38] ; _exptl_absorpt_correction_T_min 0.7795 _exptl_absorpt_correction_T_max 0.9809 #----------------------------------------------------------------------------# # DATA COLLECTION # #----------------------------------------------------------------------------# _diffrn_source 'Enraf Nonius FR590' _diffrn_ambient_temperature 173(2) _diffrn_radiation_wavelength 0.71073 _diffrn_radiation_type MoK\a _diffrn_radiation_monochromator graphite _diffrn_radiation_probe x-ray _diffrn_detector 'CCD plate' _diffrn_orient_matrix_type 'by Nonius Collect from scalepack cell' _diffrn_orient_matrix_ub_11 -0.840612E-1 _diffrn_orient_matrix_ub_12 0.165438E-1 _diffrn_orient_matrix_ub_13 -0.85115E-2 _diffrn_orient_matrix_ub_21 0.114724E-1 _diffrn_orient_matrix_ub_22 0.312792E-1 _diffrn_orient_matrix_ub_23 0.546111E-1 _diffrn_orient_matrix_ub_31 0.51994E-2 _diffrn_orient_matrix_ub_32 0.198454 _diffrn_orient_matrix_ub_33 -0.78979E-2 _diffrn_measurement_device '95mm CCD camera on \k-goniostat' _diffrn_measurement_device_type KappaCCD _diffrn_measurement_method 'CCD rotation images, thick slices' _diffrn_reflns_av_R_equivalents 0.0922 _diffrn_reflns_av_unetI/netI 0.1148 _diffrn_reflns_number 7090 _diffrn_reflns_limit_h_min -14 _diffrn_reflns_limit_h_max 15 _diffrn_reflns_limit_k_min -6 _diffrn_reflns_limit_k_max 5 _diffrn_reflns_limit_l_min -22 _diffrn_reflns_limit_l_max 22 _diffrn_reflns_theta_min 3.41 _diffrn_reflns_theta_max 25.95 _diffrn_reflns_theta_full 25.95 _diffrn_measured_fraction_theta_full 0.958 _diffrn_measured_fraction_theta_max 0.958 _reflns_number_total 3663 _reflns_number_gt 2313 _reflns_threshold_expression >2sigma(I) #----------------------------------------------------------------------------# # COMPUTER PROGRAMS USED # #----------------------------------------------------------------------------# _computing_data_collection 'Collect (Nonius BV, 1997-2000)' _computing_cell_refinement 'HKL Scalepack (Otwinowski & Minor 1997)' _computing_data_reduction 'HKL Denzo and Scalepack (Otwinowski & Minor 1997)' _computing_structure_solution 'SHELXS-97 (Sheldrick, 1997)' _computing_structure_refinement 'SHELXL-97 (Sheldrick, 1997)' _computing_molecular_graphics 'Ortep-3 for Windows (Farrugia, 1997)' _computing_publication_material 'WinGX publication routines (Farrugia, 1999)' #----------------------------------------------------------------------------# # REFINEMENT INFORMATION # #----------------------------------------------------------------------------# _refine_special_details ; The H atoms on N were refined. 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^)+(0.0590P)^2^+3.0678P] 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_number_reflns 3663 _refine_ls_number_parameters 238 _refine_ls_number_restraints 1 _refine_ls_R_factor_all 0.1334 _refine_ls_R_factor_gt 0.0736 _refine_ls_wR_factor_ref 0.1772 _refine_ls_wR_factor_gt 0.1482 _refine_ls_goodness_of_fit_ref 1.044 _refine_ls_restrained_S_all 1.044 _refine_ls_shift/su_max 0.001 _refine_ls_shift/su_mean 0 _refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881' _refine_ls_abs_structure_Flack -0.01(6) _refine_diff_density_max 1.275 _refine_diff_density_min -0.755 _refine_diff_density_rms 0.109 #----------------------------------------------------------------------------# # ATOMIC TYPES, COORDINATES AND THERMAL PARAMETERS # #----------------------------------------------------------------------------# 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 0 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' I I -0.4742 1.8119 '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 0.006 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' 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 I I 0.27245(7) 0.5924(3) 0.45067(4) 0.0747(4) Uani 1 1 d . . . O1 O 0.2482(7) 0.3805(15) 0.1689(4) 0.046(2) Uani 1 1 d . . . O2 O 0.5185(11) 0.6756(17) 0.1530(6) 0.059(3) Uani 1 1 d . . . O3 O 0.6576(8) -0.1655(16) 0.3359(6) 0.049(3) Uani 1 1 d . . . O4 O 0.8009(7) 0.1432(15) 0.3443(4) 0.051(2) Uani 1 1 d . . . N1 N 0.6280(10) 0.280(2) 0.3424(7) 0.044(3) Uani 1 1 d . . . H1 H 0.668(12) 0.43(2) 0.341(7) 0.053 Uiso 1 1 d . . . N2 N 0.4896(9) 0.259(2) 0.1934(5) 0.043(2) Uani 1 1 d . . . H2 H 0.500(9) 0.07(3) 0.193(5) 0.051 Uiso 1 1 d . . . C1 C 0.3354(10) 0.433(2) 0.3659(6) 0.042(3) Uani 1 1 d . . . C2 C 0.4672(9) 0.413(2) 0.3877(6) 0.037(3) Uani 1 1 d . . . H2A H 0.5003 0.5962 0.3917 0.045 Uiso 1 1 calc R . . H2B H 0.4946 0.3242 0.437 0.045 Uiso 1 1 calc R . . C3 C 0.5051(9) 0.254(2) 0.3301(6) 0.040(3) Uani 1 1 d . . . H3 H 0.4866 0.0595 0.3348 0.048 Uiso 1 1 calc R . . C4 C 0.4401(9) 0.353(2) 0.2512(6) 0.036(3) Uani 1 1 d . . . H4 H 0.4428 0.5543 0.2515 0.043 Uiso 1 1 calc R . . C5 C 0.3183(10) 0.270(2) 0.2369(6) 0.044(3) Uani 1 1 d . . . H5 H 0.3136 0.0686 0.234 0.052 Uiso 1 1 calc R . . C6 C 0.2731(9) 0.364(2) 0.3011(6) 0.040(3) Uani 1 1 d . . . H6 H 0.1929 0.3734 0.2926 0.049 Uiso 1 1 calc R . . C7 C 0.5312(13) 0.428(3) 0.1504(8) 0.049(4) Uani 1 1 d . . . C8 C 0.5876(13) 0.298(2) 0.0972(8) 0.063(4) Uani 1 1 d . . . H8A H 0.5455 0.3431 0.0459 0.094 Uiso 1 1 calc R . . H8B H 0.5882 0.1018 0.1038 0.094 Uiso 1 1 calc R . . H8C H 0.6658 0.3636 0.1073 0.094 Uiso 1 1 calc R . . C9 C 0.1873(12) 0.183(2) 0.1161(6) 0.056(4) Uani 1 1 d . . . H9 H 0.24 0.0303 0.1151 0.067 Uiso 1 1 calc R . . C10 C 0.1591(15) 0.326(3) 0.0392(7) 0.082(5) Uani 1 1 d . . . H10A H 0.1079 0.2081 0.0018 0.098 Uiso 1 1 calc R . . H10B H 0.1174 0.4944 0.0423 0.098 Uiso 1 1 calc R . . C11 C 0.2634(15) 0.394(4) 0.0118(10) 0.105(6) Uani 1 1 d . . . H11A H 0.3138 0.515 0.0478 0.158 Uiso 1 1 calc R . . H11B H 0.2386 0.4838 -0.0369 0.158 Uiso 1 1 calc R . . H11C H 0.3042 0.2283 0.0071 0.158 Uiso 1 1 calc R . . C12 C 0.0829(11) 0.070(4) 0.1374(7) 0.075(4) Uani 1 1 d . . . H12A H 0.0475 -0.0727 0.1015 0.09 Uiso 1 1 calc R . . H12B H 0.1084 -0.0128 0.1875 0.09 Uiso 1 1 calc R . . C13 C -0.0052(12) 0.283(4) 0.1380(9) 0.082(5) Uani 1 1 d . . . H13A H 0.0301 0.4298 0.1716 0.122 Uiso 1 1 calc R . . H13B H -0.0667 0.2032 0.1553 0.122 Uiso 1 1 calc R . . H13C H -0.0361 0.3544 0.0874 0.122 Uiso 1 1 calc R . . C14 C 0.6926(8) 0.061(3) 0.3399(5) 0.042(3) Uani 1 1 d . . . C15 C 0.8895(11) -0.063(2) 0.3408(8) 0.057(4) Uani 1 1 d . . . C16 C 0.9101(11) -0.231(2) 0.4126(7) 0.054(3) Uani 1 1 d . . . H16A H 0.8432 -0.3432 0.4103 0.081 Uiso 1 1 calc R . . H16B H 0.9236 -0.1108 0.4559 0.081 Uiso 1 1 calc R . . H16C H 0.9766 -0.3472 0.4175 0.081 Uiso 1 1 calc R . . C17 C 0.9921(10) 0.115(3) 0.3454(8) 0.070(4) Uani 1 1 d . . . H17A H 1.0578 0.0018 0.3454 0.105 Uiso 1 1 calc R . . H17B H 1.0089 0.2211 0.3915 0.105 Uiso 1 1 calc R . . H17C H 0.976 0.2366 0.3024 0.105 Uiso 1 1 calc R . . C18 C 0.8508(12) -0.222(3) 0.2705(7) 0.058(3) Uani 1 1 d . . . H18A H 0.7875 -0.3385 0.2733 0.088 Uiso 1 1 calc R . . H18B H 0.9138 -0.3322 0.2641 0.088 Uiso 1 1 calc R . . H18C H 0.8257 -0.0984 0.228 0.088 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 I 0.0442(4) 0.1245(9) 0.0562(5) -0.0239(7) 0.0151(3) 0.0004(8) O1 0.048(5) 0.042(5) 0.044(4) 0.004(4) 0.005(4) 0.001(4) O2 0.082(8) 0.037(7) 0.068(6) 0.002(4) 0.039(5) -0.009(5) O3 0.043(6) 0.018(5) 0.086(7) -0.005(4) 0.015(5) 0.005(4) O4 0.044(5) 0.027(5) 0.080(5) 0.005(4) 0.016(4) 0.018(4) N1 0.039(6) 0.027(6) 0.066(7) 0.003(5) 0.012(5) -0.012(5) N2 0.046(6) 0.030(5) 0.057(6) 0.006(5) 0.022(5) -0.001(5) C1 0.039(7) 0.050(7) 0.036(6) -0.002(5) 0.009(5) 0.013(6) C2 0.034(6) 0.035(6) 0.040(6) 0.001(5) 0.004(5) 0.001(5) C3 0.025(6) 0.031(6) 0.064(7) -0.002(5) 0.012(5) -0.008(5) C4 0.037(7) 0.031(6) 0.043(6) -0.001(5) 0.016(5) -0.018(5) C5 0.042(7) 0.043(6) 0.043(6) -0.002(5) 0.007(5) 0.001(6) C6 0.026(6) 0.050(7) 0.050(7) 0.001(5) 0.018(5) -0.010(5) C7 0.041(8) 0.041(9) 0.065(9) -0.004(7) 0.015(7) 0.010(7) C8 0.075(10) 0.038(7) 0.089(10) 0.009(7) 0.046(8) 0.012(7) C9 0.062(8) 0.058(9) 0.038(6) -0.016(5) -0.004(6) 0.001(6) C10 0.103(13) 0.073(11) 0.048(8) -0.007(7) -0.014(8) 0.000(9) C11 0.077(12) 0.172(18) 0.074(11) 0.022(11) 0.032(10) 0.012(12) C12 0.079(9) 0.068(9) 0.066(7) 0.011(10) -0.001(6) -0.011(12) C13 0.046(9) 0.108(12) 0.091(11) 0.027(10) 0.018(8) 0.001(9) C14 0.034(6) 0.039(8) 0.048(5) -0.007(7) 0.004(4) 0.017(8) C15 0.044(8) 0.033(6) 0.096(10) -0.003(7) 0.022(7) 0.022(6) C16 0.061(9) 0.037(7) 0.063(8) 0.000(6) 0.016(7) 0.017(7) C17 0.045(7) 0.033(7) 0.135(11) 0.003(10) 0.028(7) 0.001(9) C18 0.058(9) 0.049(8) 0.072(9) -0.002(7) 0.024(7) 0.003(7) #----------------------------------------------------------------------------# # MOLECULAR GEOMETRY # #----------------------------------------------------------------------------# _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 I C1 2.093(11) . ? O1 C5 1.430(12) . ? O1 C9 1.441(13) . ? O2 C7 1.242(14) . ? O3 C14 1.196(16) . ? O4 C14 1.368(14) . ? O4 C15 1.504(14) . ? N1 C14 1.355(16) . ? N1 C3 1.464(15) . ? N1 H1 0.91(12) . ? N2 C7 1.351(17) . ? N2 C4 1.449(14) . ? N2 H2 0.96(16) . ? C1 C6 1.284(14) . ? C1 C2 1.553(15) . ? C2 C3 1.504(15) . ? C2 H2A 0.99 . ? C2 H2B 0.99 . ? C3 C4 1.546(15) . ? C3 H3 1 . ? C4 C5 1.499(15) . ? C4 H4 1 . ? C5 C6 1.522(15) . ? C5 H5 1 . ? C6 H6 0.95 . ? C7 C8 1.498(19) . ? C8 H8A 0.98 . ? C8 H8B 0.98 . ? C8 H8C 0.98 . ? C9 C12 1.543(19) . ? C9 C10 1.548(17) . ? C9 H9 1 . ? C10 C11 1.54(2) . ? C10 H10A 0.99 . ? C10 H10B 0.99 . ? C11 H11A 0.98 . ? C11 H11B 0.98 . ? C11 H11C 0.98 . ? C12 C13 1.51(2) . ? C12 H12A 0.99 . ? C12 H12B 0.99 . ? C13 H13A 0.98 . ? C13 H13B 0.98 . ? C13 H13C 0.98 . ? C15 C18 1.489(18) . ? C15 C17 1.517(19) . ? C15 C16 1.539(18) . ? C16 H16A 0.98 . ? C16 H16B 0.98 . ? C16 H16C 0.98 . ? C17 H17A 0.98 . ? C17 H17B 0.98 . ? C17 H17C 0.98 . ? C18 H18A 0.98 . ? C18 H18B 0.98 . ? C18 H18C 0.98 . ? 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 C5 O1 C9 114.6(8) . . ? C14 O4 C15 119.5(10) . . ? C14 N1 C3 120.4(10) . . ? C14 N1 H1 111(9) . . ? C3 N1 H1 127(9) . . ? C7 N2 C4 122.9(10) . . ? C7 N2 H2 123(6) . . ? C4 N2 H2 114(6) . . ? C6 C1 C2 122.4(10) . . ? C6 C1 I 124.2(9) . . ? C2 C1 I 113.4(7) . . ? C3 C2 C1 110.4(8) . . ? C3 C2 H2A 109.6 . . ? C1 C2 H2A 109.6 . . ? C3 C2 H2B 109.6 . . ? C1 C2 H2B 109.6 . . ? H2A C2 H2B 108.1 . . ? N1 C3 C2 110.2(9) . . ? N1 C3 C4 111.0(9) . . ? C2 C3 C4 109.4(9) . . ? N1 C3 H3 108.7 . . ? C2 C3 H3 108.7 . . ? C4 C3 H3 108.7 . . ? N2 C4 C5 112.2(9) . . ? N2 C4 C3 113.2(9) . . ? C5 C4 C3 108.0(8) . . ? N2 C4 H4 107.8 . . ? C5 C4 H4 107.8 . . ? C3 C4 H4 107.8 . . ? O1 C5 C4 112.1(9) . . ? O1 C5 C6 108.6(9) . . ? C4 C5 C6 109.5(8) . . ? O1 C5 H5 108.9 . . ? C4 C5 H5 108.9 . . ? C6 C5 H5 108.9 . . ? C1 C6 C5 124.7(10) . . ? C1 C6 H6 117.6 . . ? C5 C6 H6 117.6 . . ? O2 C7 N2 121.3(15) . . ? O2 C7 C8 122.4(16) . . ? N2 C7 C8 116.2(11) . . ? C7 C8 H8A 109.5 . . ? C7 C8 H8B 109.5 . . ? H8A C8 H8B 109.5 . . ? C7 C8 H8C 109.5 . . ? H8A C8 H8C 109.5 . . ? H8B C8 H8C 109.5 . . ? O1 C9 C12 112.3(11) . . ? O1 C9 C10 105.4(10) . . ? C12 C9 C10 114.4(11) . . ? O1 C9 H9 108.2 . . ? C12 C9 H9 108.2 . . ? C10 C9 H9 108.2 . . ? C11 C10 C9 114.4(13) . . ? C11 C10 H10A 108.7 . . ? C9 C10 H10A 108.7 . . ? C11 C10 H10B 108.7 . . ? C9 C10 H10B 108.7 . . ? H10A C10 H10B 107.6 . . ? C10 C11 H11A 109.5 . . ? C10 C11 H11B 109.5 . . ? H11A C11 H11B 109.5 . . ? C10 C11 H11C 109.5 . . ? H11A C11 H11C 109.5 . . ? H11B C11 H11C 109.5 . . ? C13 C12 C9 113.0(14) . . ? C13 C12 H12A 109 . . ? C9 C12 H12A 109 . . ? C13 C12 H12B 109 . . ? C9 C12 H12B 109 . . ? H12A C12 H12B 107.8 . . ? 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 . . ? O3 C14 N1 123.8(11) . . ? O3 C14 O4 127.5(11) . . ? N1 C14 O4 108.7(12) . . ? C18 C15 O4 109.8(10) . . ? C18 C15 C17 114.6(12) . . ? O4 C15 C17 101.5(10) . . ? C18 C15 C16 114.4(11) . . ? O4 C15 C16 106.2(10) . . ? C17 C15 C16 109.3(11) . . ? 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 . . ? 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 . . ? 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 . . ? #===END