# Supplementary Material (ESI) for ChemComm
# This journal is © The Royal Society of Chemistry 2000
# CCDC Number: 182/1493
 
data_wy0024wm 
 
_audit_creation_method            SHELXL-97 
_chemical_name_systematic 
; 
 ? 
; 
_chemical_name_common             ? 
_chemical_melting_point           ? 
_chemical_formula_moiety          ? 
_chemical_formula_sum 
 'C13 H24 O2 S2 Si' 
_chemical_formula_weight          304.53 
 
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' 
 'O'  'O'   0.0106   0.0060 
 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' 
 'Si'  'Si'   0.0817   0.0704 
 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' 
 'S'  'S'   0.1246   0.1234 
 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' 
 
_symmetry_cell_setting            Triclinic 
_symmetry_space_group_name_H-M    P-1 
 
loop_ 
 _symmetry_equiv_pos_as_xyz 
 'x, y, z' 
 '-x, -y, -z' 
 
_cell_length_a                    7.9504(5) 
_cell_length_b                    15.8566(10) 
_cell_length_c                    16.0012(10) 
_cell_angle_alpha                 118.6320(10) 
_cell_angle_beta                  98.4490(10) 
_cell_angle_gamma                 97.3550(10) 
_cell_volume                      1704.97(19) 
_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        block 
_exptl_crystal_colour             colorless 
_exptl_crystal_size_max           0.36 
_exptl_crystal_size_mid           0.29
_exptl_crystal_size_min           0.27
_exptl_crystal_density_meas       ? 
_exptl_crystal_density_diffrn     1.186 
_exptl_crystal_density_method     'not measured' 
_exptl_crystal_F_000              656 
_exptl_absorpt_coefficient_mu     0.376 
_exptl_absorpt_correction_type    ? 
_exptl_absorpt_correction_T_min   ? 
_exptl_absorpt_correction_T_max   ? 
_exptl_absorpt_process_details    ? 
 
_exptl_special_details 
; 
 ? 
; 
 
_diffrn_ambient_temperature       293(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   ? 
_diffrn_measurement_method        ? 
_diffrn_detector_area_resol_mean  ? 
_diffrn_standards_number          ? 
_diffrn_standards_interval_count  ? 
_diffrn_standards_interval_time   ? 
_diffrn_standards_decay_%         ? 
_diffrn_reflns_number             10061 
_diffrn_reflns_av_R_equivalents   0.0128 
_diffrn_reflns_av_sigmaI/netI     0.0248 
_diffrn_reflns_limit_h_min        -10 
_diffrn_reflns_limit_h_max        4 
_diffrn_reflns_limit_k_min        -20 
_diffrn_reflns_limit_k_max        20 
_diffrn_reflns_limit_l_min        -20 
_diffrn_reflns_limit_l_max        20 
_diffrn_reflns_theta_min          1.49 
_diffrn_reflns_theta_max          27.51 
_reflns_number_total              7271 
_reflns_number_gt                 5439 
_reflns_threshold_expression      >2sigma(I) 
 
_computing_data_collection        'SMART CCD'
_computing_cell_refinement        ? 
_computing_data_reduction         SAINT 
_computing_structure_solution     'SHELXS-97 (Sheldrick, 1990)' 
_computing_structure_refinement   'SHELXL-97 (Sheldrick, 1997)' 
_computing_molecular_graphics     ? 
_computing_publication_material   ? 
 
_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^)+(0.0626P)^2^+0.0829P] 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_number_reflns          7271 
_refine_ls_number_parameters      337 
_refine_ls_number_restraints      0 
_refine_ls_R_factor_all           0.0551 
_refine_ls_R_factor_gt            0.0390 
_refine_ls_wR_factor_ref          0.1140 
_refine_ls_wR_factor_gt           0.1061 
_refine_ls_goodness_of_fit_ref    1.054 
_refine_ls_restrained_S_all       1.054 
_refine_ls_shift/su_max           0.004 
_refine_ls_shift/su_mean          0.001 
 
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 
Si1 Si 0.23476(7) 0.75320(4) 0.99570(4) 0.05119(14) Uani 1 1 d . . . 
Si2 Si 0.56329(6) 0.75369(4) 0.41584(4) 0.04761(14) Uani 1 1 d . . . 
S4 S 0.30310(6) 0.58323(3) 0.53900(3) 0.04954(13) Uani 1 1 d . . . 
S2 S -0.03339(9) 0.64852(4) 0.79654(4) 0.07444(19) Uani 1 1 d . . . 
S1 S -0.07854(7) 0.87124(4) 0.83237(3) 0.05858(15) Uani 1 1 d . . . 
S3 S 0.38594(9) 0.82075(4) 0.58987(4) 0.07588(19) Uani 1 1 d . . . 
C10 C 0.0806(2) 0.76202(14) 0.89794(13) 0.0502(4) Uani 1 1 d . . . 
C23 C 0.4577(2) 0.72521(13) 0.50212(12) 0.0467(4) Uani 1 1 d . . . 
C24 C 0.4261(2) 0.63336(14) 0.48596(13) 0.0489(4) Uani 1 1 d . . . 
H24 H 0.4775 0.5899 0.4395 0.059 Uiso 1 1 calc R . . 
C11 C 0.0561(3) 0.84854(14) 0.91128(13) 0.0545(5) Uani 1 1 d . . . 
H11 H 0.1191 0.9038 0.9703 0.065 Uiso 1 1 calc R . . 
O2 O -0.1763(2) 0.93968(12) 0.88580(11) 0.0788(5) Uani 1 1 d . . . 
O4 O 0.41672(19) 0.56369(12) 0.60310(11) 0.0702(4) Uani 1 1 d . . . 
C17 C 0.3756(2) 0.73284(15) 0.31573(14) 0.0572(5) Uani 1 1 d . . . 
H17 H 0.4276 0.7428 0.2684 0.069 Uiso 1 1 calc R . . 
O1 O 0.0257(2) 0.89881(15) 0.77995(13) 0.0926(5) Uani 1 1 d . . . 
O3 O 0.1736(2) 0.50110(12) 0.46113(11) 0.0813(5) Uani 1 1 d . . . 
C20 C 0.6975(3) 0.66046(17) 0.36078(16) 0.0616(5) Uani 1 1 d . . . 
H20 H 0.6196 0.5958 0.3348 0.074 Uiso 1 1 calc R . . 
C25 C 0.2061(3) 0.67429(17) 0.61013(16) 0.0644(5) Uani 1 1 d . . . 
H25 H 0.1186 0.6567 0.6353 0.077 Uiso 1 1 calc R . . 
C14 C 0.6814(3) 0.88746(15) 0.48732(16) 0.0649(6) Uani 1 1 d . . . 
H14 H 0.5937 0.9247 0.5129 0.078 Uiso 1 1 calc R . . 
C7 C 0.4064(3) 0.87180(17) 1.06767(16) 0.0694(6) Uani 1 1 d . . . 
H7 H 0.3428 0.9246 1.0848 0.083 Uiso 1 1 calc R . . 
C4 C 0.3177(3) 0.63798(17) 0.93067(18) 0.0732(6) Uani 1 1 d . . . 
H4 H 0.2140 0.5835 0.8936 0.088 Uiso 1 1 calc R . . 
C1 C 0.0968(3) 0.73980(19) 1.07696(17) 0.0701(6) Uani 1 1 d . . . 
H1 H 0.1773 0.7402 1.1299 0.084 Uiso 1 1 calc R . . 
C26 C 0.2450(3) 0.76696(17) 0.63208(15) 0.0666(6) Uani 1 1 d . . . 
H26 H 0.1888 0.8091 0.6764 0.080 Uiso 1 1 calc R . . 
C13 C -0.1979(3) 0.67385(18) 0.73717(16) 0.0766(7) Uani 1 1 d . . . 
H13 H -0.2821 0.6194 0.6874 0.092 Uiso 1 1 calc R . . 
C19 C 0.2654(3) 0.62731(19) 0.25974(18) 0.0817(7) Uani 1 1 d . . . 
H19A H 0.2121 0.6140 0.3035 0.123 Uiso 1 1 calc R . . 
H19B H 0.3386 0.5821 0.2330 0.123 Uiso 1 1 calc R . . 
H19C H 0.1762 0.6194 0.2075 0.123 Uiso 1 1 calc R . . 
C18 C 0.2601(3) 0.8074(2) 0.35186(18) 0.0798(7) Uani 1 1 d . . . 
H18A H 0.1659 0.7921 0.2982 0.120 Uiso 1 1 calc R . . 
H18B H 0.3286 0.8727 0.3775 0.120 Uiso 1 1 calc R . . 
H18C H 0.2134 0.8039 0.4024 0.120 Uiso 1 1 calc R . . 
C15 C 0.8259(4) 0.9157(2) 0.5768(2) 0.1037(10) Uani 1 1 d . . . 
H15A H 0.9185 0.8836 0.5557 0.156 Uiso 1 1 calc R . . 
H15B H 0.7792 0.8955 0.6181 0.156 Uiso 1 1 calc R . . 
H15C H 0.8705 0.9860 0.6129 0.156 Uiso 1 1 calc R . . 
C22 C 0.7531(3) 0.6594(2) 0.27165(19) 0.0889(8) Uani 1 1 d . . . 
H22A H 0.8280 0.7219 0.2927 0.133 Uiso 1 1 calc R . . 
H22B H 0.6512 0.6475 0.2236 0.133 Uiso 1 1 calc R . . 
H22C H 0.8146 0.6080 0.2433 0.133 Uiso 1 1 calc R . . 
C16 C 0.7505(4) 0.9241(2) 0.4233(2) 0.0941(9) Uani 1 1 d . . . 
H16A H 0.7934 0.9944 0.4613 0.141 Uiso 1 1 calc R . . 
H16B H 0.6579 0.9073 0.3684 0.141 Uiso 1 1 calc R . . 
H16C H 0.8437 0.8934 0.4002 0.141 Uiso 1 1 calc R . . 
C12 C -0.2213(3) 0.76012(19) 0.75240(17) 0.0849(8) Uani 1 1 d . . . 
H12 H -0.3240 0.7609 0.7168 0.102 Uiso 1 1 calc R . . 
C5 C 0.4231(5) 0.6146(2) 1.0021(2) 0.1164(11) Uani 1 1 d . . . 
H5A H 0.4453 0.5500 0.9663 0.175 Uiso 1 1 calc R . . 
H5B H 0.3579 0.6165 1.0487 0.175 Uiso 1 1 calc R . . 
H5C H 0.5320 0.6626 1.0360 0.175 Uiso 1 1 calc R . . 
C21 C 0.8540(3) 0.6665(2) 0.4336(2) 0.0889(8) Uani 1 1 d . . . 
H21A H 0.9019 0.6096 0.4019 0.133 Uiso 1 1 calc R . . 
H21B H 0.8166 0.6686 0.4887 0.133 Uiso 1 1 calc R . . 
H21C H 0.9416 0.7252 0.4556 0.133 Uiso 1 1 calc R . . 
C3 C 0.0140(4) 0.8282(3) 1.1266(2) 0.1080(11) Uani 1 1 d . . . 
H3A H -0.0689 0.8300 1.0778 0.162 Uiso 1 1 calc R . . 
H3B H 0.1034 0.8881 1.1607 0.162 Uiso 1 1 calc R . . 
H3C H -0.0443 0.8217 1.1724 0.162 Uiso 1 1 calc R . . 
C9 C 0.5327(4) 0.8885(2) 1.0111(3) 0.1084(10) Uani 1 1 d . . . 
H9A H 0.5999 0.9554 1.0484 0.163 Uiso 1 1 calc R . . 
H9B H 0.4680 0.8763 0.9493 0.163 Uiso 1 1 calc R . . 
H9C H 0.6098 0.8443 0.9998 0.163 Uiso 1 1 calc R . . 
C2 C -0.0401(4) 0.6414(3) 1.0262(2) 0.1132(11) Uani 1 1 d . . . 
H2A H -0.0990 0.6377 1.0730 0.170 Uiso 1 1 calc R . . 
H2B H 0.0169 0.5875 1.0001 0.170 Uiso 1 1 calc R . . 
H2C H -0.1234 0.6375 0.9739 0.170 Uiso 1 1 calc R . . 
C6 C 0.4201(4) 0.6348(2) 0.8555(2) 0.1089(10) Uani 1 1 d . . . 
H6A H 0.5342 0.6774 0.8892 0.163 Uiso 1 1 calc R . . 
H6B H 0.3592 0.6565 0.8157 0.163 Uiso 1 1 calc R . . 
H6C H 0.4308 0.5684 0.8147 0.163 Uiso 1 1 calc R . . 
C8 C 0.5072(4) 0.8879(2) 1.1660(2) 0.1073(10) Uani 1 1 d . . . 
H8A H 0.5657 0.8353 1.1538 0.161 Uiso 1 1 calc R . . 
H8B H 0.4269 0.8888 1.2056 0.161 Uiso 1 1 calc R . . 
H8C H 0.5917 0.9498 1.1997 0.161 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 
Si1 0.0576(3) 0.0537(3) 0.0510(3) 0.0305(2) 0.0136(2) 0.0234(2) 
Si2 0.0453(3) 0.0498(3) 0.0513(3) 0.0303(2) 0.0096(2) 0.0052(2) 
S4 0.0492(3) 0.0523(3) 0.0532(3) 0.0306(2) 0.0169(2) 0.0097(2) 
S2 0.0907(4) 0.0494(3) 0.0632(3) 0.0198(3) -0.0025(3) 0.0131(3) 
S1 0.0705(3) 0.0636(3) 0.0445(2) 0.0256(2) 0.0120(2) 0.0348(3) 
S3 0.1112(5) 0.0501(3) 0.0722(4) 0.0273(3) 0.0453(3) 0.0260(3) 
C10 0.0579(11) 0.0501(10) 0.0418(9) 0.0213(8) 0.0117(8) 0.0186(9) 
C23 0.0489(10) 0.0488(10) 0.0452(9) 0.0257(8) 0.0120(8) 0.0111(8) 
C24 0.0487(10) 0.0521(10) 0.0570(10) 0.0322(9) 0.0230(8) 0.0165(8) 
C11 0.0643(12) 0.0503(10) 0.0427(9) 0.0194(8) 0.0032(8) 0.0214(9) 
O2 0.0839(10) 0.0812(11) 0.0630(9) 0.0242(8) 0.0144(8) 0.0490(9) 
O4 0.0773(10) 0.0869(10) 0.0757(9) 0.0578(9) 0.0257(8) 0.0340(8) 
C17 0.0517(11) 0.0682(13) 0.0548(11) 0.0357(10) 0.0098(9) 0.0088(9) 
O1 0.1041(13) 0.1287(16) 0.0851(11) 0.0745(12) 0.0382(11) 0.0528(12) 
O3 0.0652(9) 0.0793(11) 0.0704(9) 0.0229(8) 0.0177(8) -0.0146(8) 
C20 0.0530(11) 0.0689(13) 0.0753(13) 0.0419(11) 0.0274(10) 0.0178(10) 
C25 0.0679(13) 0.0785(15) 0.0676(13) 0.0444(12) 0.0361(11) 0.0294(11) 
C14 0.0687(13) 0.0552(12) 0.0673(12) 0.0360(10) 0.0039(10) -0.0036(10) 
C7 0.0660(13) 0.0635(13) 0.0745(14) 0.0357(12) -0.0014(11) 0.0193(11) 
C4 0.0893(16) 0.0657(14) 0.0775(14) 0.0391(12) 0.0253(13) 0.0413(12) 
C1 0.0715(14) 0.0957(17) 0.0655(13) 0.0533(13) 0.0210(11) 0.0328(13) 
C26 0.0813(15) 0.0757(15) 0.0567(12) 0.0348(11) 0.0338(11) 0.0375(12) 
C13 0.0745(15) 0.0688(15) 0.0509(11) 0.0103(10) -0.0062(11) 0.0110(12) 
C19 0.0677(14) 0.0801(16) 0.0747(15) 0.0342(13) -0.0077(12) -0.0057(12) 
C18 0.0687(14) 0.1046(19) 0.0799(16) 0.0553(15) 0.0140(12) 0.0325(14) 
C15 0.103(2) 0.0854(19) 0.0925(19) 0.0483(16) -0.0276(17) -0.0289(16) 
C22 0.0860(17) 0.114(2) 0.0895(18) 0.0584(17) 0.0498(15) 0.0365(16) 
C16 0.106(2) 0.0775(17) 0.0958(18) 0.0543(16) 0.0104(16) -0.0180(15) 
C12 0.0845(16) 0.0804(17) 0.0577(13) 0.0177(12) -0.0169(12) 0.0287(14) 
C5 0.152(3) 0.119(2) 0.125(2) 0.080(2) 0.043(2) 0.093(2) 
C21 0.0642(14) 0.119(2) 0.121(2) 0.083(2) 0.0312(15) 0.0390(15) 
C3 0.119(2) 0.161(3) 0.096(2) 0.081(2) 0.0643(18) 0.088(2) 
C9 0.0880(19) 0.105(2) 0.140(3) 0.076(2) 0.0178(19) -0.0013(17) 
C2 0.096(2) 0.143(3) 0.127(3) 0.093(2) 0.0332(19) 0.005(2) 
C6 0.141(3) 0.109(2) 0.102(2) 0.0506(19) 0.068(2) 0.075(2) 
C8 0.098(2) 0.107(2) 0.0940(19) 0.0510(18) -0.0245(17) 0.0037(18) 
 
_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 
Si1 C7 1.879(2) . ? 
Si1 C4 1.883(2) . ? 
Si1 C1 1.887(2) . ? 
Si1 C10 1.9128(18) . ? 
Si2 C20 1.879(2) . ? 
Si2 C14 1.881(2) . ? 
Si2 C17 1.8881(19) . ? 
Si2 C23 1.9118(18) . ? 
S4 O3 1.4260(15) . ? 
S4 O4 1.4379(14) . ? 
S4 C25 1.716(2) . ? 
S4 C24 1.7321(17) . ? 
S2 C13 1.705(2) . ? 
S2 C10 1.7450(19) . ? 
S1 O2 1.4264(15) . ? 
S1 O1 1.4300(18) . ? 
S1 C12 1.712(3) . ? 
S1 C11 1.7342(18) . ? 
S3 C26 1.723(2) . ? 
S3 C23 1.7352(19) . ? 
C10 C11 1.329(3) . ? 
C23 C24 1.333(2) . ? 
C17 C19 1.526(3) . ? 
C17 C18 1.534(3) . ? 
C20 C21 1.533(3) . ? 
C20 C22 1.547(3) . ? 
C25 C26 1.317(3) . ? 
C14 C15 1.530(3) . ? 
C14 C16 1.530(3) . ? 
C7 C9 1.526(4) . ? 
C7 C8 1.540(3) . ? 
C4 C5 1.532(3) . ? 
C4 C6 1.533(4) . ? 
C1 C3 1.533(3) . ? 
C1 C2 1.540(4) . ? 
C13 C12 1.313(3) . ? 
 
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 
C7 Si1 C4 115.65(11) . . ? 
C7 Si1 C1 110.24(11) . . ? 
C4 Si1 C1 109.53(11) . . ? 
C7 Si1 C10 107.59(9) . . ? 
C4 Si1 C10 107.29(9) . . ? 
C1 Si1 C10 106.05(9) . . ? 
C20 Si2 C14 117.00(10) . . ? 
C20 Si2 C17 108.83(10) . . ? 
C14 Si2 C17 109.90(9) . . ? 
C20 Si2 C23 107.48(9) . . ? 
C14 Si2 C23 107.65(9) . . ? 
C17 Si2 C23 105.34(8) . . ? 
O3 S4 O4 116.64(11) . . ? 
O3 S4 C25 110.06(11) . . ? 
O4 S4 C25 107.69(10) . . ? 
O3 S4 C24 106.98(9) . . ? 
O4 S4 C24 109.66(9) . . ? 
C25 S4 C24 105.23(10) . . ? 
C13 S2 C10 105.67(11) . . ? 
O2 S1 O1 116.22(11) . . ? 
O2 S1 C12 108.09(12) . . ? 
O1 S1 C12 109.35(13) . . ? 
O2 S1 C11 109.55(9) . . ? 
O1 S1 C11 108.37(10) . . ? 
C12 S1 C11 104.64(11) . . ? 
C26 S3 C23 105.96(10) . . ? 
C11 C10 S2 123.86(14) . . ? 
C11 C10 Si1 121.37(14) . . ? 
S2 C10 Si1 114.62(10) . . ? 
C24 C23 S3 123.76(14) . . ? 
C24 C23 Si2 119.82(14) . . ? 
S3 C23 Si2 115.99(10) . . ? 
C23 C24 S4 129.35(15) . . ? 
C10 C11 S1 128.06(15) . . ? 
C19 C17 C18 110.77(18) . . ? 
C19 C17 Si2 112.66(15) . . ? 
C18 C17 Si2 113.38(15) . . ? 
C21 C20 C22 111.12(18) . . ? 
C21 C20 Si2 115.18(17) . . ? 
C22 C20 Si2 112.31(16) . . ? 
C26 C25 S4 125.56(17) . . ? 
C15 C14 C16 110.34(19) . . ? 
C15 C14 Si2 114.87(16) . . ? 
C16 C14 Si2 113.09(16) . . ? 
C9 C7 C8 110.6(2) . . ? 
C9 C7 Si1 115.17(18) . . ? 
C8 C7 Si1 113.17(17) . . ? 
C5 C4 C6 110.0(2) . . ? 
C5 C4 Si1 112.42(17) . . ? 
C6 C4 Si1 115.41(18) . . ? 
C3 C1 C2 111.5(2) . . ? 
C3 C1 Si1 112.28(17) . . ? 
C2 C1 Si1 114.11(18) . . ? 
C25 C26 S3 128.83(17) . . ? 
C12 C13 S2 128.58(18) . . ? 
C13 C12 S1 125.45(19) . . ? 
 
_diffrn_measured_fraction_theta_max    0.926 
_diffrn_reflns_theta_full              27.51 
_diffrn_measured_fraction_theta_full   0.926 
_refine_diff_density_max    0.624 
_refine_diff_density_min   -0.351 
_refine_diff_density_rms    0.041