# Electronic Supplementary Material (ESI) for Organic Chemistry Frontiers.
# This journal is © the Partner Organisations 2015

####################################################################### 
# 
# This file contains crystal structure data downloaded from the 
# Cambridge Structural Database (CSD) hosted by the Cambridge 
# Crystallographic Data Centre (CCDC).
# 
# Full information about CCDC data access policies and citation 
# guidelines are available at http://www.ccdc.cam.ac.uk/access/V1 
# 
# Audit and citation data items may have been added by the CCDC. 
# Please retain this information to preserve the provenance of 
# this file and to allow appropriate attribution of the data. 
# 
#######################################################################

data_20150603scm_0m
_database_code_depnum_ccdc_archive 'CCDC 1417164'
_audit_update_record             
;
2015-08-06 deposited with the CCDC.
2015-09-06 downloaded from the CCDC.
;

_audit_creation_method           SHELXL-97
_chemical_name_systematic        scm5-1986
_chemical_name_common            ?
_chemical_melting_point          ?
_chemical_formula_moiety         ?
_chemical_formula_sum            'C21 H33 N O4 Si'
_chemical_formula_weight         391.57

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'
Si Si 0.0817 0.0704 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'

_symmetry_cell_setting           Orthorhombic
_symmetry_space_group_name_H-M   P2(1)2(1)2(1)

loop_
_symmetry_equiv_pos_as_xyz
'x, y, z'
'x+1/2, -y+1/2, -z'
'-x, y+1/2, -z+1/2'
'-x+1/2, -y, z+1/2'

_cell_length_a                   6.3258(2)
_cell_length_b                   17.6205(6)
_cell_length_c                   20.9213(7)
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_volume                     2331.97(13)
_cell_formula_units_Z            4
_cell_measurement_temperature    296(2)
_cell_measurement_reflns_used    4499
_cell_measurement_theta_min      2.26
_cell_measurement_theta_max      18.90

_exptl_crystal_description       block
_exptl_crystal_colour            colorless
_exptl_crystal_size_max          0.3
_exptl_crystal_size_mid          0.3
_exptl_crystal_size_min          0.2
_exptl_crystal_density_meas      ?
_exptl_crystal_density_diffrn    1.115
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             848
_exptl_absorpt_coefficient_mu    0.124
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_correction_T_min  0.6753
_exptl_absorpt_correction_T_max  0.7457
_exptl_absorpt_process_details   ?

_exptl_special_details           
; 
 ? 
;

_diffrn_ambient_temperature      296(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       'φ and ω scans'
_diffrn_detector_area_resol_mean ?
_diffrn_standards_number         0
_diffrn_standards_interval_count ?
_diffrn_standards_interval_time  ?
_diffrn_standards_decay_%        ?
_diffrn_reflns_number            30738
_diffrn_reflns_av_R_equivalents  0.0460
_diffrn_reflns_av_sigmaI/netI    0.0497
_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_k_min       -23
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_theta_min         1.51
_diffrn_reflns_theta_max         28.31
_reflns_number_total             5715
_reflns_number_gt                3222
_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  'Bruker SHELXTL'

_refine_special_details          
; 
 Refinement of F² against ALL reflections.  The weighted R-factor wR and 
 goodness of fit S are based on F², conventional R-factors R are based 
 on F, with F set to zero for negative F². The threshold expression of 
 F² > 2sigma(F²) is used only for calculating R-factors(gt) etc. and is 
 not relevant to the choice of reflections for refinement.  R-factors based 
 on F² 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/[σ²(Fo²)+(0.0928P)²+0.0000P] where P=(Fo²+2Fc²)/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     SHELXL
_refine_ls_extinction_coef       0.024(2)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc²λ³/sin(2θ)]^-1/4^
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.17(16)
_chemical_absolute_configuration rm
_refine_ls_number_reflns         5715
_refine_ls_number_parameters     253
_refine_ls_number_restraints     0
_refine_ls_R_factor_all          0.1041
_refine_ls_R_factor_gt           0.0518
_refine_ls_wR_factor_ref         0.1503
_refine_ls_wR_factor_gt          0.1285
_refine_ls_goodness_of_fit_ref   0.933
_refine_ls_restrained_S_all      0.933
_refine_ls_shift/su_max          0.000
_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
Si1 Si 0.10327(12) 0.44200(4) 0.04259(4) 0.0641(2) Uani 1 1 d . . .
O4 O 0.2524(3) 0.51858(8) 0.03951(8) 0.0602(4) Uani 1 1 d . . .
N1 N 0.2628(3) 0.71753(10) 0.07438(9) 0.0492(5) Uani 1 1 d . . .
C5 C 0.2868(4) 0.78103(14) 0.11252(12) 0.0566(6) Uani 1 1 d . . .
O3 O 0.3403(3) 0.75999(8) 0.17197(8) 0.0569(4) Uani 1 1 d . . .
C4 C 0.2697(4) 0.63766(12) 0.09766(10) 0.0475(5) Uani 1 1 d . . .
H4 H 0.4170 0.6230 0.1054 0.057 Uiso 1 1 calc R . .
C1 C 0.2645(4) 0.72115(14) 0.00743(12) 0.0583(6) Uani 1 1 d . . .
O1 O 0.2619(3) 0.77895(11) -0.02379(9) 0.0736(5) Uani 1 1 d . . .
C2 C 0.2734(5) 0.64121(15) -0.01694(12) 0.0642(7) Uani 1 1 d . . .
H2A H 0.4175 0.6264 -0.0267 0.077 Uiso 1 1 calc R . .
H2B H 0.1872 0.6353 -0.0550 0.077 Uiso 1 1 calc R . .
C3 C 0.1861(4) 0.59507(12) 0.03784(11) 0.0517(5) Uani 1 1 d . . .
H3 H 0.0313 0.5972 0.0372 0.062 Uiso 1 1 calc R . .
C10 C 0.1412(4) 0.62067(12) 0.15575(11) 0.0496(6) Uani 1 1 d . . .
O2 O 0.2622(4) 0.84441(10) 0.09467(10) 0.0894(7) Uani 1 1 d . . .
C6 C 0.3250(5) 0.81519(14) 0.22541(14) 0.0681(7) Uani 1 1 d . . .
C15 C -0.0620(4) 0.64828(14) 0.16274(12) 0.0601(6) Uani 1 1 d . . .
H15 H -0.1178 0.6811 0.1323 0.072 Uiso 1 1 calc R . .
C11 C 0.2205(5) 0.57051(13) 0.20122(12) 0.0650(7) Uani 1 1 d . . .
H11 H 0.3564 0.5511 0.1966 0.078 Uiso 1 1 calc R . .
C12 C 0.1000(7) 0.54938(17) 0.25279(14) 0.0834(9) Uani 1 1 d . . .
H12 H 0.1548 0.5160 0.2830 0.100 Uiso 1 1 calc R . .
C7 C 0.4853(7) 0.8768(2) 0.21767(18) 0.1022(11) Uani 1 1 d . . .
H7A H 0.6232 0.8547 0.2132 0.153 Uiso 1 1 calc R . .
H7B H 0.4828 0.9091 0.2546 0.153 Uiso 1 1 calc R . .
H7C H 0.4528 0.9060 0.1802 0.153 Uiso 1 1 calc R . .
C13 C -0.1005(7) 0.57727(19) 0.25995(15) 0.0911(11) Uani 1 1 d . . .
H13 H -0.1815 0.5627 0.2950 0.109 Uiso 1 1 calc R . .
C9 C 0.3684(8) 0.76591(19) 0.28242(16) 0.1085(13) Uani 1 1 d . . .
H9A H 0.2703 0.7243 0.2830 0.163 Uiso 1 1 calc R . .
H9B H 0.3525 0.7953 0.3208 0.163 Uiso 1 1 calc R . .
H9C H 0.5100 0.7466 0.2800 0.163 Uiso 1 1 calc R . .
C17 C 0.2407(7) 0.3751(2) 0.09681(16) 0.0981(11) Uani 1 1 d . . .
H17A H 0.3867 0.3713 0.0847 0.147 Uiso 1 1 calc R . .
H17B H 0.1756 0.3260 0.0939 0.147 Uiso 1 1 calc R . .
H17C H 0.2310 0.3933 0.1400 0.147 Uiso 1 1 calc R . .
C14 C -0.1833(5) 0.62712(18) 0.21525(15) 0.0802(9) Uani 1 1 d . . .
H14 H -0.3192 0.6463 0.2203 0.096 Uiso 1 1 calc R . .
C16 C -0.1638(6) 0.4631(2) 0.0740(2) 0.1098(13) Uani 1 1 d . . .
H16A H -0.1515 0.4907 0.1134 0.165 Uiso 1 1 calc R . .
H16B H -0.2382 0.4165 0.0815 0.165 Uiso 1 1 calc R . .
H16C H -0.2401 0.4932 0.0435 0.165 Uiso 1 1 calc R . .
C8 C 0.1010(7) 0.8444(2) 0.2284(2) 0.1133(13) Uani 1 1 d . . .
H8A H 0.0691 0.8718 0.1900 0.170 Uiso 1 1 calc R . .
H8B H 0.0859 0.8775 0.2646 0.170 Uiso 1 1 calc R . .
H8C H 0.0053 0.8024 0.2327 0.170 Uiso 1 1 calc R . .
C18 C 0.0954(6) 0.40060(18) -0.04077(16) 0.0882(9) Uani 1 1 d . . .
C19 C -0.0325(9) 0.3263(3) -0.0396(3) 0.1386(18) Uani 1 1 d . . .
H19A H -0.1699 0.3358 -0.0219 0.208 Uiso 1 1 calc R . .
H19B H 0.0399 0.2894 -0.0138 0.208 Uiso 1 1 calc R . .
H19C H -0.0472 0.3072 -0.0823 0.208 Uiso 1 1 calc R . .
C20 C 0.3219(7) 0.3835(3) -0.0624(2) 0.1246(15) Uani 1 1 d . . .
H20A H 0.3186 0.3567 -0.1024 0.187 Uiso 1 1 calc R . .
H20B H 0.3911 0.3528 -0.0308 0.187 Uiso 1 1 calc R . .
H20C H 0.3980 0.4302 -0.0676 0.187 Uiso 1 1 calc R . .
C21 C -0.0120(10) 0.4574(3) -0.0849(2) 0.145(2) Uani 1 1 d . . .
H21A H -0.0345 0.4345 -0.1260 0.217 Uiso 1 1 calc R . .
H21B H 0.0763 0.5014 -0.0896 0.217 Uiso 1 1 calc R . .
H21C H -0.1455 0.4722 -0.0670 0.217 Uiso 1 1 calc R . .


_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 O4 1.6478(17) . ?
Si1 C16 1.851(4) . ?
Si1 C17 1.853(3) . ?
Si1 C18 1.891(3) . ?
O4 C3 1.412(3) . ?
N1 C5 1.383(3) . ?
N1 C1 1.402(3) . ?
N1 C4 1.490(3) . ?
C5 O2 1.188(3) . ?
C5 O3 1.341(3) . ?
O3 C6 1.485(3) . ?
C4 C10 1.493(3) . ?
C4 C3 1.552(3) . ?
C4 H4 0.9800 . ?
C1 O1 1.210(3) . ?
C1 C2 1.499(4) . ?
C2 C3 1.510(3) . ?
C2 H2A 0.9700 . ?
C2 H2B 0.9700 . ?
C3 H3 0.9800 . ?
C10 C15 1.382(4) . ?
C10 C11 1.392(3) . ?
C6 C7 1.493(4) . ?
C6 C9 1.501(4) . ?
C6 C8 1.509(5) . ?
C15 C14 1.391(4) . ?
C15 H15 0.9300 . ?
C11 C12 1.372(4) . ?
C11 H11 0.9300 . ?
C12 C13 1.369(5) . ?
C12 H12 0.9300 . ?
C7 H7A 0.9600 . ?
C7 H7B 0.9600 . ?
C7 H7C 0.9600 . ?
C13 C14 1.386(5) . ?
C13 H13 0.9300 . ?
C9 H9A 0.9600 . ?
C9 H9B 0.9600 . ?
C9 H9C 0.9600 . ?
C17 H17A 0.9600 . ?
C17 H17B 0.9600 . ?
C17 H17C 0.9600 . ?
C14 H14 0.9300 . ?
C16 H16A 0.9600 . ?
C16 H16B 0.9600 . ?
C16 H16C 0.9600 . ?
C8 H8A 0.9600 . ?
C8 H8B 0.9600 . ?
C8 H8C 0.9600 . ?
C18 C21 1.522(5) . ?
C18 C20 1.533(6) . ?
C18 C19 1.540(5) . ?
C19 H19A 0.9600 . ?
C19 H19B 0.9600 . ?
C19 H19C 0.9600 . ?
C20 H20A 0.9600 . ?
C20 H20B 0.9600 . ?
C20 H20C 0.9600 . ?
C21 H21A 0.9600 . ?
C21 H21B 0.9600 . ?
C21 H21C 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
O4 Si1 C16 111.82(13) . . ?
O4 Si1 C17 106.06(14) . . ?
C16 Si1 C17 109.8(2) . . ?
O4 Si1 C18 107.15(13) . . ?
C16 Si1 C18 112.42(18) . . ?
C17 Si1 C18 109.35(17) . . ?
C3 O4 Si1 127.77(15) . . ?
C5 N1 C1 122.6(2) . . ?
C5 N1 C4 124.92(19) . . ?
C1 N1 C4 111.68(19) . . ?
O2 C5 O3 125.8(2) . . ?
O2 C5 N1 124.4(2) . . ?
O3 C5 N1 109.83(19) . . ?
C5 O3 C6 120.05(19) . . ?
N1 C4 C10 116.08(18) . . ?
N1 C4 C3 100.55(16) . . ?
C10 C4 C3 111.96(19) . . ?
N1 C4 H4 109.3 . . ?
C10 C4 H4 109.3 . . ?
C3 C4 H4 109.3 . . ?
O1 C1 N1 125.3(2) . . ?
O1 C1 C2 127.4(2) . . ?
N1 C1 C2 107.3(2) . . ?
C1 C2 C3 103.5(2) . . ?
C1 C2 H2A 111.1 . . ?
C3 C2 H2A 111.1 . . ?
C1 C2 H2B 111.1 . . ?
C3 C2 H2B 111.1 . . ?
H2A C2 H2B 109.0 . . ?
O4 C3 C2 115.1(2) . . ?
O4 C3 C4 109.90(18) . . ?
C2 C3 C4 103.13(17) . . ?
O4 C3 H3 109.5 . . ?
C2 C3 H3 109.5 . . ?
C4 C3 H3 109.5 . . ?
C15 C10 C11 119.1(2) . . ?
C15 C10 C4 121.5(2) . . ?
C11 C10 C4 119.2(2) . . ?
O3 C6 C7 110.5(2) . . ?
O3 C6 C9 102.0(2) . . ?
C7 C6 C9 112.5(3) . . ?
O3 C6 C8 108.4(2) . . ?
C7 C6 C8 113.2(3) . . ?
C9 C6 C8 109.6(3) . . ?
C10 C15 C14 120.2(3) . . ?
C10 C15 H15 119.9 . . ?
C14 C15 H15 119.9 . . ?
C12 C11 C10 120.6(3) . . ?
C12 C11 H11 119.7 . . ?
C10 C11 H11 119.7 . . ?
C13 C12 C11 120.2(3) . . ?
C13 C12 H12 119.9 . . ?
C11 C12 H12 119.9 . . ?
C6 C7 H7A 109.5 . . ?
C6 C7 H7B 109.5 . . ?
H7A C7 H7B 109.5 . . ?
C6 C7 H7C 109.5 . . ?
H7A C7 H7C 109.5 . . ?
H7B C7 H7C 109.5 . . ?
C12 C13 C14 120.3(3) . . ?
C12 C13 H13 119.9 . . ?
C14 C13 H13 119.9 . . ?
C6 C9 H9A 109.5 . . ?
C6 C9 H9B 109.5 . . ?
H9A C9 H9B 109.5 . . ?
C6 C9 H9C 109.5 . . ?
H9A C9 H9C 109.5 . . ?
H9B C9 H9C 109.5 . . ?
Si1 C17 H17A 109.5 . . ?
Si1 C17 H17B 109.5 . . ?
H17A C17 H17B 109.5 . . ?
Si1 C17 H17C 109.5 . . ?
H17A C17 H17C 109.5 . . ?
H17B C17 H17C 109.5 . . ?
C13 C14 C15 119.6(3) . . ?
C13 C14 H14 120.2 . . ?
C15 C14 H14 120.2 . . ?
Si1 C16 H16A 109.5 . . ?
Si1 C16 H16B 109.5 . . ?
H16A C16 H16B 109.5 . . ?
Si1 C16 H16C 109.5 . . ?
H16A C16 H16C 109.5 . . ?
H16B C16 H16C 109.5 . . ?
C6 C8 H8A 109.5 . . ?
C6 C8 H8B 109.5 . . ?
H8A C8 H8B 109.5 . . ?
C6 C8 H8C 109.5 . . ?
H8A C8 H8C 109.5 . . ?
H8B C8 H8C 109.5 . . ?
C21 C18 C20 111.5(4) . . ?
C21 C18 C19 109.6(4) . . ?
C20 C18 C19 109.2(4) . . ?
C21 C18 Si1 108.5(3) . . ?
C20 C18 Si1 108.9(2) . . ?
C19 C18 Si1 109.1(3) . . ?
C18 C19 H19A 109.5 . . ?
C18 C19 H19B 109.5 . . ?
H19A C19 H19B 109.5 . . ?
C18 C19 H19C 109.5 . . ?
H19A C19 H19C 109.5 . . ?
H19B C19 H19C 109.5 . . ?
C18 C20 H20A 109.5 . . ?
C18 C20 H20B 109.5 . . ?
H20A C20 H20B 109.5 . . ?
C18 C20 H20C 109.5 . . ?
H20A C20 H20C 109.5 . . ?
H20B C20 H20C 109.5 . . ?
C18 C21 H21A 109.5 . . ?
C18 C21 H21B 109.5 . . ?
H21A C21 H21B 109.5 . . ?
C18 C21 H21C 109.5 . . ?
H21A C21 H21C 109.5 . . ?
H21B C21 H21C 109.5 . . ?

loop_
_geom_torsion_atom_site_label_1
_geom_torsion_atom_site_label_2
_geom_torsion_atom_site_label_3
_geom_torsion_atom_site_label_4
_geom_torsion
_geom_torsion_site_symmetry_1
_geom_torsion_site_symmetry_2
_geom_torsion_site_symmetry_3
_geom_torsion_site_symmetry_4
_geom_torsion_publ_flag
C16 Si1 O4 C3 -21.6(3) . . . . ?
C17 Si1 O4 C3 -141.3(2) . . . . ?
C18 Si1 O4 C3 102.0(2) . . . . ?
C1 N1 C5 O2 18.2(4) . . . . ?
C4 N1 C5 O2 -172.9(3) . . . . ?
C1 N1 C5 O3 -162.1(2) . . . . ?
C4 N1 C5 O3 6.8(3) . . . . ?
O2 C5 O3 C6 14.4(4) . . . . ?
N1 C5 O3 C6 -165.3(2) . . . . ?
C5 N1 C4 C10 47.3(3) . . . . ?
C1 N1 C4 C10 -142.8(2) . . . . ?
C5 N1 C4 C3 168.3(2) . . . . ?
C1 N1 C4 C3 -21.8(3) . . . . ?
C5 N1 C1 O1 -9.1(4) . . . . ?
C4 N1 C1 O1 -179.3(2) . . . . ?
C5 N1 C1 C2 170.1(2) . . . . ?
C4 N1 C1 C2 -0.1(3) . . . . ?
O1 C1 C2 C3 -158.0(3) . . . . ?
N1 C1 C2 C3 22.9(3) . . . . ?
Si1 O4 C3 C2 -125.9(2) . . . . ?
Si1 O4 C3 C4 118.18(19) . . . . ?
C1 C2 C3 O4 -155.4(2) . . . . ?
C1 C2 C3 C4 -35.7(3) . . . . ?
N1 C4 C3 O4 157.85(17) . . . . ?
C10 C4 C3 O4 -78.3(2) . . . . ?
N1 C4 C3 C2 34.6(2) . . . . ?
C10 C4 C3 C2 158.5(2) . . . . ?
N1 C4 C10 C15 43.6(3) . . . . ?
C3 C4 C10 C15 -71.1(3) . . . . ?
N1 C4 C10 C11 -142.2(2) . . . . ?
C3 C4 C10 C11 103.2(2) . . . . ?
C5 O3 C6 C7 -67.9(3) . . . . ?
C5 O3 C6 C9 172.3(3) . . . . ?
C5 O3 C6 C8 56.7(3) . . . . ?
C11 C10 C15 C14 1.2(4) . . . . ?
C4 C10 C15 C14 175.4(2) . . . . ?
C15 C10 C11 C12 -0.8(4) . . . . ?
C4 C10 C11 C12 -175.2(2) . . . . ?
C10 C11 C12 C13 0.3(4) . . . . ?
C11 C12 C13 C14 -0.1(5) . . . . ?
C12 C13 C14 C15 0.5(4) . . . . ?
C10 C15 C14 C13 -1.0(4) . . . . ?
O4 Si1 C18 C21 -63.8(3) . . . . ?
C16 Si1 C18 C21 59.5(3) . . . . ?
C17 Si1 C18 C21 -178.3(3) . . . . ?
O4 Si1 C18 C20 57.8(3) . . . . ?
C16 Si1 C18 C20 -178.9(3) . . . . ?
C17 Si1 C18 C20 -56.7(3) . . . . ?
O4 Si1 C18 C19 176.9(3) . . . . ?
C16 Si1 C18 C19 -59.8(4) . . . . ?
C17 Si1 C18 C19 62.4(4) . . . . ?

_diffrn_measured_fraction_theta_max 0.992
_diffrn_reflns_theta_full        28.31
_diffrn_measured_fraction_theta_full 0.992
_refine_diff_density_max         0.484
_refine_diff_density_min         -0.280
_refine_diff_density_rms         0.112
