# Electronic Supplementary Material (ESI) for Organic & Biomolecular Chemistry
# This journal is © The Royal Society of Chemistry 2012


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#                                CCDC 
# 
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# 
#  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. 
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#  fide research purposes only. It may contain copyright material 
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data_al66
_database_code_depnum_ccdc_archive 'CCDC 862191'
#TrackingRef '9022_web_deposit_cif_file_0_B.Sridhar_1326282382.al66f.cif'


_audit_creation_method           SHELXL-97
_chemical_name_systematic        
;
(1R*,4aS*,10aS*)-1-(3,4-dimethoxyphenyl)-1,3,4,4a,10,10a-hexahydropyrano
[4,3-b]chromene
;
_chemical_name_common            ?
_chemical_melting_point          ?
_chemical_formula_moiety         'C20 H22 O4'
_chemical_formula_sum            'C20 H22 O4'
_chemical_formula_weight         326.38

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'

_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_H-M   'P 21/c'
_symmetry_space_group_name_Hall  '-P 2ybc'

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

_cell_length_a                   12.8286(7)
_cell_length_b                   12.1802(7)
_cell_length_c                   11.4263(6)
_cell_angle_alpha                90.00
_cell_angle_beta                 111.313(1)
_cell_angle_gamma                90.00
_cell_volume                     1663.31(16)
_cell_formula_units_Z            4
_cell_measurement_temperature    294(2)
_cell_measurement_reflns_used    9913
_cell_measurement_theta_min      2.39
_cell_measurement_theta_max      27.99

_exptl_crystal_description       block
_exptl_crystal_colour            colorless
_exptl_crystal_size_max          0.18
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.09
_exptl_crystal_density_meas      ?
_exptl_crystal_density_diffrn    1.303
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             696
_exptl_absorpt_coefficient_mu    0.090
_exptl_absorpt_correction_type   none
_exptl_absorpt_correction_T_min  ?
_exptl_absorpt_correction_T_max  ?
_exptl_absorpt_process_details   ?

_exptl_special_details           
;
?
;

_diffrn_ambient_temperature      294(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  'CCD Area Detector'
_diffrn_measurement_device       'Bruker SMART APEX CCD area-detector'
_diffrn_measurement_method       '\w scan'
_diffrn_detector_area_resol_mean ?
_diffrn_standards_number         0
_diffrn_standards_interval_count ?
_diffrn_standards_interval_time  ?
_diffrn_standards_decay_%        ?
_diffrn_reflns_number            15572
_diffrn_reflns_av_R_equivalents  0.0169
_diffrn_reflns_av_sigmaI/netI    0.0121
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_theta_min         1.70
_diffrn_reflns_theta_max         25.00
_reflns_number_total             2927
_reflns_number_gt                2641
_reflns_threshold_expression     I>2\s(I)

_computing_data_collection       'SMART (Bruker, 2001)'
_computing_cell_refinement       'SAINT (Bruker, 2001)'
_computing_data_reduction        SAINT
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_molecular_graphics    'SHELXTL/PC (Sheldrick, 1990)'
_computing_publication_material  SHELXL97

_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^)+(0.0515P)^2^+0.2672P] 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    constr
_refine_ls_extinction_method     none
_refine_ls_extinction_coef       ?
_refine_ls_number_reflns         2927
_refine_ls_number_parameters     219
_refine_ls_number_restraints     0
_refine_ls_R_factor_all          0.0358
_refine_ls_R_factor_gt           0.0327
_refine_ls_wR_factor_ref         0.0938
_refine_ls_wR_factor_gt          0.0900
_refine_ls_goodness_of_fit_ref   1.047
_refine_ls_restrained_S_all      1.047
_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
C1 C 0.72171(10) 1.10503(11) 0.72385(12) 0.0508(3) Uani 1 1 d . . .
H1A H 0.7398 1.1802 0.7105 0.061 Uiso 1 1 calc R . .
H1B H 0.6818 1.1062 0.7815 0.061 Uiso 1 1 calc R . .
C2 C 0.64662(10) 1.05577(10) 0.59922(12) 0.0491(3) Uani 1 1 d . . .
H2A H 0.6216 0.9835 0.6132 0.059 Uiso 1 1 calc R . .
H2B H 0.5812 1.1018 0.5616 0.059 Uiso 1 1 calc R . .
C3 C 0.71102(10) 1.04716(10) 0.51146(11) 0.0454(3) Uani 1 1 d . . .
H3 H 0.7291 1.1221 0.4938 0.055 Uiso 1 1 calc R . .
C4 C 0.64371(10) 0.88594(11) 0.38226(11) 0.0479(3) Uani 1 1 d . . .
C5 C 0.56732(12) 0.84261(13) 0.27163(12) 0.0593(4) Uani 1 1 d . . .
H5 H 0.5190 0.8890 0.2115 0.071 Uiso 1 1 calc R . .
C6 C 0.56330(14) 0.73088(14) 0.25124(14) 0.0710(4) Uani 1 1 d . . .
H6 H 0.5120 0.7018 0.1775 0.085 Uiso 1 1 calc R . .
C7 C 0.63507(15) 0.66230(13) 0.33974(16) 0.0723(4) Uani 1 1 d . . .
H7 H 0.6323 0.5869 0.3260 0.087 Uiso 1 1 calc R . .
C8 C 0.71121(13) 0.70556(12) 0.44908(14) 0.0608(4) Uani 1 1 d . . .
H8 H 0.7597 0.6585 0.5081 0.073 Uiso 1 1 calc R . .
C9 C 0.71716(10) 0.81798(10) 0.47312(11) 0.0478(3) Uani 1 1 d . . .
C10 C 0.79984(10) 0.86542(10) 0.59208(11) 0.0468(3) Uani 1 1 d . . .
H10A H 0.8696 0.8249 0.6159 0.056 Uiso 1 1 calc R . .
H10B H 0.7710 0.8581 0.6593 0.056 Uiso 1 1 calc R . .
C11 C 0.82162(10) 0.98652(10) 0.57437(10) 0.0428(3) Uani 1 1 d . . .
H11 H 0.8653 0.9915 0.5198 0.051 Uiso 1 1 calc R . .
C12 C 0.88654(10) 1.04477(9) 0.69910(11) 0.0428(3) Uani 1 1 d . . .
H12 H 0.8980 1.1214 0.6805 0.051 Uiso 1 1 calc R . .
C13 C 0.99975(10) 0.99433(9) 0.76918(10) 0.0419(3) Uani 1 1 d . . .
C14 C 1.09120(10) 1.02552(10) 0.74114(11) 0.0487(3) Uani 1 1 d . . .
H14 H 1.0832 1.0797 0.6811 0.058 Uiso 1 1 calc R . .
C15 C 1.19534(10) 0.97726(11) 0.80119(12) 0.0489(3) Uani 1 1 d . . .
H15 H 1.2562 0.9991 0.7809 0.059 Uiso 1 1 calc R . .
C16 C 1.20863(9) 0.89701(10) 0.89071(10) 0.0424(3) Uani 1 1 d . . .
C17 C 1.11593(9) 0.86433(9) 0.91994(10) 0.0402(3) Uani 1 1 d . . .
C18 C 1.01303(9) 0.91318(9) 0.86001(10) 0.0420(3) Uani 1 1 d . . .
H18 H 0.9520 0.8919 0.8803 0.050 Uiso 1 1 calc R . .
C19 C 1.04693(11) 0.75197(10) 1.04634(12) 0.0520(3) Uani 1 1 d . . .
H19A H 1.0220 0.8151 1.0791 0.078 Uiso 1 1 calc R . .
H19B H 1.0722 0.6967 1.1104 0.078 Uiso 1 1 calc R . .
H19C H 0.9862 0.7235 0.9757 0.078 Uiso 1 1 calc R . .
C20 C 1.39978(11) 0.87037(13) 0.91984(15) 0.0648(4) Uani 1 1 d . . .
H20A H 1.3798 0.8556 0.8318 0.097 Uiso 1 1 calc R . .
H20B H 1.4627 0.8258 0.9671 0.097 Uiso 1 1 calc R . .
H20C H 1.4190 0.9465 0.9359 0.097 Uiso 1 1 calc R . .
O1 O 0.82281(7) 1.04377(7) 0.77847(7) 0.0461(2) Uani 1 1 d . . .
O2 O 0.64281(7) 0.99829(7) 0.39288(8) 0.0534(2) Uani 1 1 d . . .
O3 O 1.13651(7) 0.78248(7) 1.00756(8) 0.0490(2) Uani 1 1 d . . .
O4 O 1.30786(7) 0.84557(8) 0.95625(8) 0.0530(2) Uani 1 1 d . . .

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
C1 0.0489(7) 0.0517(7) 0.0500(7) -0.0026(5) 0.0157(6) 0.0100(5)
C2 0.0439(6) 0.0496(7) 0.0505(7) 0.0009(5) 0.0131(5) 0.0063(5)
C3 0.0477(6) 0.0432(6) 0.0404(6) 0.0023(5) 0.0101(5) -0.0021(5)
C4 0.0484(7) 0.0559(7) 0.0430(6) -0.0051(5) 0.0211(5) -0.0058(5)
C5 0.0559(7) 0.0773(9) 0.0442(7) -0.0086(6) 0.0177(6) -0.0109(7)
C6 0.0748(10) 0.0847(11) 0.0557(8) -0.0249(8) 0.0263(8) -0.0245(9)
C7 0.0902(11) 0.0608(9) 0.0738(10) -0.0247(8) 0.0393(9) -0.0189(8)
C8 0.0714(9) 0.0525(8) 0.0633(8) -0.0087(6) 0.0302(7) -0.0032(7)
C9 0.0511(7) 0.0506(7) 0.0461(6) -0.0062(5) 0.0231(5) -0.0030(5)
C10 0.0496(7) 0.0455(6) 0.0442(6) -0.0012(5) 0.0156(5) 0.0056(5)
C11 0.0431(6) 0.0483(6) 0.0378(6) 0.0016(5) 0.0156(5) -0.0005(5)
C12 0.0458(6) 0.0408(6) 0.0413(6) 0.0020(5) 0.0151(5) -0.0007(5)
C13 0.0444(6) 0.0410(6) 0.0378(6) -0.0024(4) 0.0121(5) -0.0018(5)
C14 0.0511(7) 0.0501(7) 0.0440(6) 0.0071(5) 0.0161(5) -0.0037(5)
C15 0.0438(6) 0.0562(7) 0.0488(7) 0.0013(6) 0.0193(5) -0.0064(5)
C16 0.0413(6) 0.0443(6) 0.0398(6) -0.0058(5) 0.0125(5) -0.0009(5)
C17 0.0472(6) 0.0381(6) 0.0355(6) -0.0028(4) 0.0151(5) 0.0004(5)
C18 0.0429(6) 0.0438(6) 0.0412(6) -0.0015(5) 0.0175(5) -0.0023(5)
C19 0.0594(7) 0.0498(7) 0.0495(7) 0.0052(6) 0.0228(6) -0.0044(6)
C20 0.0402(7) 0.0780(10) 0.0735(9) 0.0047(8) 0.0173(6) -0.0034(6)
O1 0.0474(5) 0.0496(5) 0.0407(4) 0.0000(3) 0.0153(4) 0.0071(4)
O2 0.0557(5) 0.0552(5) 0.0403(5) 0.0014(4) 0.0066(4) 0.0011(4)
O3 0.0524(5) 0.0484(5) 0.0487(5) 0.0097(4) 0.0214(4) 0.0070(4)
O4 0.0420(5) 0.0622(5) 0.0536(5) 0.0047(4) 0.0159(4) 0.0051(4)

_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
C1 O1 1.4283(14) . ?
C1 C2 1.5228(17) . ?
C1 H1A 0.9700 . ?
C1 H1B 0.9700 . ?
C2 C3 1.5170(17) . ?
C2 H2A 0.9700 . ?
C2 H2B 0.9700 . ?
C3 O2 1.4471(14) . ?
C3 C11 1.5277(16) . ?
C3 H3 0.9800 . ?
C4 O2 1.3742(16) . ?
C4 C5 1.3916(18) . ?
C4 C9 1.3928(18) . ?
C5 C6 1.379(2) . ?
C5 H5 0.9300 . ?
C6 C7 1.375(2) . ?
C6 H6 0.9300 . ?
C7 C8 1.380(2) . ?
C7 H7 0.9300 . ?
C8 C9 1.3932(18) . ?
C8 H8 0.9300 . ?
C9 C10 1.5028(17) . ?
C10 C11 1.5284(17) . ?
C10 H10A 0.9700 . ?
C10 H10B 0.9700 . ?
C11 C12 1.5379(16) . ?
C11 H11 0.9800 . ?
C12 O1 1.4248(14) . ?
C12 C13 1.5107(16) . ?
C12 H12 0.9800 . ?
C13 C14 1.3772(17) . ?
C13 C18 1.3980(16) . ?
C14 C15 1.3910(18) . ?
C14 H14 0.9300 . ?
C15 C16 1.3799(17) . ?
C15 H15 0.9300 . ?
C16 O4 1.3715(14) . ?
C16 C17 1.4046(16) . ?
C17 O3 1.3688(13) . ?
C17 C18 1.3815(16) . ?
C18 H18 0.9300 . ?
C19 O3 1.4230(15) . ?
C19 H19A 0.9600 . ?
C19 H19B 0.9600 . ?
C19 H19C 0.9600 . ?
C20 O4 1.4182(16) . ?
C20 H20A 0.9600 . ?
C20 H20B 0.9600 . ?
C20 H20C 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
O1 C1 C2 111.60(10) . . ?
O1 C1 H1A 109.3 . . ?
C2 C1 H1A 109.3 . . ?
O1 C1 H1B 109.3 . . ?
C2 C1 H1B 109.3 . . ?
H1A C1 H1B 108.0 . . ?
C3 C2 C1 109.51(10) . . ?
C3 C2 H2A 109.8 . . ?
C1 C2 H2A 109.8 . . ?
C3 C2 H2B 109.8 . . ?
C1 C2 H2B 109.8 . . ?
H2A C2 H2B 108.2 . . ?
O2 C3 C2 110.98(10) . . ?
O2 C3 C11 112.57(10) . . ?
C2 C3 C11 110.99(10) . . ?
O2 C3 H3 107.3 . . ?
C2 C3 H3 107.3 . . ?
C11 C3 H3 107.3 . . ?
O2 C4 C5 115.60(12) . . ?
O2 C4 C9 123.45(11) . . ?
C5 C4 C9 120.93(12) . . ?
C6 C5 C4 119.91(15) . . ?
C6 C5 H5 120.0 . . ?
C4 C5 H5 120.0 . . ?
C7 C6 C5 120.10(14) . . ?
C7 C6 H6 120.0 . . ?
C5 C6 H6 120.0 . . ?
C6 C7 C8 119.87(14) . . ?
C6 C7 H7 120.1 . . ?
C8 C7 H7 120.1 . . ?
C7 C8 C9 121.58(15) . . ?
C7 C8 H8 119.2 . . ?
C9 C8 H8 119.2 . . ?
C4 C9 C8 117.61(12) . . ?
C4 C9 C10 120.63(11) . . ?
C8 C9 C10 121.76(12) . . ?
C9 C10 C11 110.75(10) . . ?
C9 C10 H10A 109.5 . . ?
C11 C10 H10A 109.5 . . ?
C9 C10 H10B 109.5 . . ?
C11 C10 H10B 109.5 . . ?
H10A C10 H10B 108.1 . . ?
C3 C11 C10 110.22(10) . . ?
C3 C11 C12 108.09(9) . . ?
C10 C11 C12 112.70(9) . . ?
C3 C11 H11 108.6 . . ?
C10 C11 H11 108.6 . . ?
C12 C11 H11 108.6 . . ?
O1 C12 C13 108.82(9) . . ?
O1 C12 C11 110.07(9) . . ?
C13 C12 C11 113.33(9) . . ?
O1 C12 H12 108.2 . . ?
C13 C12 H12 108.2 . . ?
C11 C12 H12 108.2 . . ?
C14 C13 C18 118.91(11) . . ?
C14 C13 C12 120.03(10) . . ?
C18 C13 C12 121.02(10) . . ?
C13 C14 C15 121.02(11) . . ?
C13 C14 H14 119.5 . . ?
C15 C14 H14 119.5 . . ?
C16 C15 C14 120.18(11) . . ?
C16 C15 H15 119.9 . . ?
C14 C15 H15 119.9 . . ?
O4 C16 C15 124.64(11) . . ?
O4 C16 C17 116.02(10) . . ?
C15 C16 C17 119.33(11) . . ?
O3 C17 C18 124.87(10) . . ?
O3 C17 C16 115.18(10) . . ?
C18 C17 C16 119.94(10) . . ?
C17 C18 C13 120.61(11) . . ?
C17 C18 H18 119.7 . . ?
C13 C18 H18 119.7 . . ?
O3 C19 H19A 109.5 . . ?
O3 C19 H19B 109.5 . . ?
H19A C19 H19B 109.5 . . ?
O3 C19 H19C 109.5 . . ?
H19A C19 H19C 109.5 . . ?
H19B C19 H19C 109.5 . . ?
O4 C20 H20A 109.5 . . ?
O4 C20 H20B 109.5 . . ?
H20A C20 H20B 109.5 . . ?
O4 C20 H20C 109.5 . . ?
H20A C20 H20C 109.5 . . ?
H20B C20 H20C 109.5 . . ?
C12 O1 C1 110.95(9) . . ?
C4 O2 C3 118.07(9) . . ?
C17 O3 C19 117.07(9) . . ?
C16 O4 C20 116.63(10) . . ?

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
O1 C1 C2 C3 -55.50(14) . . . . ?
C1 C2 C3 O2 178.72(9) . . . . ?
C1 C2 C3 C11 52.74(13) . . . . ?
O2 C4 C5 C6 178.80(12) . . . . ?
C9 C4 C5 C6 0.4(2) . . . . ?
C4 C5 C6 C7 -0.4(2) . . . . ?
C5 C6 C7 C8 0.0(2) . . . . ?
C6 C7 C8 C9 0.4(2) . . . . ?
O2 C4 C9 C8 -178.31(11) . . . . ?
C5 C4 C9 C8 0.00(18) . . . . ?
O2 C4 C9 C10 1.37(18) . . . . ?
C5 C4 C9 C10 179.68(11) . . . . ?
C7 C8 C9 C4 -0.4(2) . . . . ?
C7 C8 C9 C10 179.94(13) . . . . ?
C4 C9 C10 C11 -21.99(15) . . . . ?
C8 C9 C10 C11 157.68(12) . . . . ?
O2 C3 C11 C10 -56.11(13) . . . . ?
C2 C3 C11 C10 68.97(12) . . . . ?
O2 C3 C11 C12 -179.69(9) . . . . ?
C2 C3 C11 C12 -54.60(12) . . . . ?
C9 C10 C11 C3 47.61(13) . . . . ?
C9 C10 C11 C12 168.46(10) . . . . ?
C3 C11 C12 O1 59.54(12) . . . . ?
C10 C11 C12 O1 -62.53(12) . . . . ?
C3 C11 C12 C13 -178.34(9) . . . . ?
C10 C11 C12 C13 59.59(13) . . . . ?
O1 C12 C13 C14 -151.98(11) . . . . ?
C11 C12 C13 C14 85.21(13) . . . . ?
O1 C12 C13 C18 30.15(14) . . . . ?
C11 C12 C13 C18 -92.66(13) . . . . ?
C18 C13 C14 C15 0.31(18) . . . . ?
C12 C13 C14 C15 -177.61(11) . . . . ?
C13 C14 C15 C16 -0.19(19) . . . . ?
C14 C15 C16 O4 -179.10(11) . . . . ?
C14 C15 C16 C17 0.31(18) . . . . ?
O4 C16 C17 O3 -2.04(15) . . . . ?
C15 C16 C17 O3 178.50(10) . . . . ?
O4 C16 C17 C18 178.90(10) . . . . ?
C15 C16 C17 C18 -0.57(17) . . . . ?
O3 C17 C18 C13 -178.27(10) . . . . ?
C16 C17 C18 C13 0.69(17) . . . . ?
C14 C13 C18 C17 -0.56(17) . . . . ?
C12 C13 C18 C17 177.33(10) . . . . ?
C13 C12 O1 C1 171.39(9) . . . . ?
C11 C12 O1 C1 -63.86(12) . . . . ?
C2 C1 O1 C12 61.89(13) . . . . ?
C5 C4 O2 C3 173.00(10) . . . . ?
C9 C4 O2 C3 -8.61(17) . . . . ?
C2 C3 O2 C4 -88.80(12) . . . . ?
C11 C3 O2 C4 36.29(14) . . . . ?
C18 C17 O3 C19 -5.15(16) . . . . ?
C16 C17 O3 C19 175.84(10) . . . . ?
C15 C16 O4 C20 -6.12(18) . . . . ?
C17 C16 O4 C20 174.45(11) . . . . ?

_diffrn_measured_fraction_theta_max 1.000
_diffrn_reflns_theta_full        25.00
_diffrn_measured_fraction_theta_full 1.000
_refine_diff_density_max         0.145
_refine_diff_density_min         -0.151
_refine_diff_density_rms         0.032