#------------------------------------------------------------------------------
#$Date: 2024-05-11 03:59:05 +0200 (Sat 11 de May de 2024) $
#$Revision: 291821 $
#$URL: svn://www.crystallography.net/cod/cif/1/57/15/1571598.cif $
#------------------------------------------------------------------------------
#
# This file is available in the Crystallography Open Database (COD),
# http://www.crystallography.net/. The original data for this entry
# were provided by IUCr Journals, http://journals.iucr.org/.
#
# The file may be used within the scientific community so long as
# proper attribution is given to the journal article from which the
# data were obtained.
#
data_1571598
loop_
_publ_author_name
'Zwolenik, A.'
'Tchoń, D'
'Makal, A.'
_publ_section_title
;
 Evolution of structure and spectroscopic properties of a new
 1,3-diacetylpyrene polymorph with temperature and pressure.
;
_journal_issue                   4
_journal_name_full               IUCrJ
_journal_paper_doi               10.1107/S2052252524003634
_journal_volume                  11
_journal_year                    2024
_chemical_formula_moiety         'C20 H14 O2'
_chemical_formula_sum            'C20 H14 O2'
_chemical_formula_weight         286.333
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_symmetry_Int_Tables_number      14
_audit_creation_date             2024-02-20
_audit_creation_method
;
Olex2 1.5-alpha
(compiled 2023.11.24 svn.r209d9fb for OlexSys, GUI svn.r6869)
;
_cell_angle_alpha                90
_cell_angle_beta                 103.701(3)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   7.2350(3)
_cell_length_b                   11.2573(4)
_cell_length_c                   17.7365(5)
_cell_measurement_reflns_used    3144
_cell_measurement_temperature    293(1)
_cell_measurement_theta_max      77.0770
_cell_measurement_theta_min      4.6850
_cell_volume                     1403.47(9)
_computing_cell_refinement       'CrysAlisPro 1.171.42.70a (Rigaku OD, 2022)'
_computing_data_collection       'CrysAlisPro 1.171.42.70a (Rigaku OD, 2022)'
_computing_data_reduction        'CrysAlisPro 1.171.42.70a (Rigaku OD, 2022)'
_computing_molecular_graphics    'Olex2 1.5-alpha (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 1.5-alpha (Dolomanov et al., 2009)'
_computing_structure_refinement  'olex2.refine 1.5-alpha (Bourhis et al., 2015)'
_computing_structure_solution    'SHELXT 2018/2 (Sheldrick, 2018)'
_diffrn_ambient_temperature      293(1)
_diffrn_detector_area_resol_mean 10.0000
_diffrn_detector_type            HyPix
_diffrn_measured_fraction_theta_full 0.9905
_diffrn_measured_fraction_theta_max 0.9769
_diffrn_measurement_details
;
List of Runs (angles in degrees, time in seconds):

  # Type    Start    End  Width  tₑₓₚ   ω     θ     κ     φ   Frames
--------------------------------------------------------------------------
  1  ω    -59.00  23.00   0.50    0.20    --    0.00 -75.00  67.00  164
  2  ω     49.00 140.00   0.50    4.00    --   66.57  75.00-164.00  182
  3  ω     13.00  98.00   0.50    4.00    --   66.57 -75.00  67.00  170
  4  ω     53.00  79.00   0.50   20.00    --  121.75 -75.00  67.00   52
  5  ω     98.00 178.00   0.50   20.00    --  121.75  75.00-164.00  160
  6  ω     86.00 127.00   0.50   20.00    --  121.75 -75.00  67.00   82
  7  ω    -11.00  59.00   0.50    0.20    --    0.00  75.00-164.00  140
  8  ω     28.00  53.00   0.50    0.20    --    0.00 -99.00 -90.00   50
  9  ω     95.00 146.00   0.50    4.00    --   66.57 125.00  90.00  102
 10  ω    100.00 128.00   0.50    4.00    --   66.57 125.00 120.00   56
 11  ω    107.00 141.00   0.50    4.00    --   66.57 125.00 150.00   68
 12  ω     47.00  97.00   0.50    4.00    --   66.57-125.00 -90.00  100
 13  ω     60.00 106.00   0.50    4.00    --   66.57-125.00  30.00   92
 14  ω     97.00 148.00   0.50    4.00    --   66.57 125.00   0.00  102
 15  ω     38.00 164.00   0.50   20.00    --  121.75 -77.00  30.00  252
 16  ω    142.00 168.00   0.50   20.00    --  121.75  50.00 -60.00   52
 17  ω    114.00 139.00   0.50   20.00    --  121.75  50.00 -60.00   50
 18  ω     38.00  97.00   0.50   20.00    --  121.75-111.00 -90.00  118
 19  ω     73.00 103.00   0.50   20.00    --  121.75 178.00-150.00   60
 20  ω     85.00 125.00   0.50   20.00    --  121.75  77.00 120.00   80
 21  ω    114.00 140.00   0.50   20.00    --  121.75 -50.00 120.00   52
 22  ω     42.00 106.00   0.50   20.00    --  121.75 -50.00 120.00  128
 23  ω     33.00  60.00   0.50   20.00    --  121.75 -91.00  30.00   54
 24  ω    103.00 178.00   0.50   20.00    --  121.75 111.00 150.00  150
 25  ω    112.00 163.00   0.50   20.00    --  121.75  77.00-150.00  102
 26  ω     42.00 101.00   0.50   20.00    --  121.75-111.00  30.00  118
 27  ω     68.00  93.00   0.50   20.00    --  121.75 -91.00  30.00   50
 28  ω     86.00 112.00   0.50   20.00    --  121.75 178.00 150.00   52
 29  ω    141.00 168.00   0.50   20.00    --  121.75  38.00 120.00   54
 30  ω    134.00 159.00   0.50   20.00    --  121.75 -63.00-180.00   50
 31  ω     64.00  90.00   0.50   20.00    --  121.75 -63.00-180.00   52
 32  ω    133.00 159.00   0.50   20.00    --  121.75 111.00-150.00   52
 33  ω     82.00 107.00   0.50   20.00    --  121.75-111.00-120.00   50
 34  ω    109.00 134.00   0.50   20.00    --  121.75  63.00 150.00   50
 35  ω     38.00  69.00   0.50   20.00    --  121.75-111.00   0.00   62
 36  ω    145.00 171.00   0.50   20.00    --  121.75  77.00 120.00   52
 37  ω    117.00 178.00   0.50   20.00    --  121.75 111.00 120.00  122
;
_diffrn_measurement_device       'four-circle diffractometer'
_diffrn_measurement_device_type  'SuperNova, Dual, Cu at home/near, HyPix'
_diffrn_measurement_method       'ω scans'
_diffrn_radiation_type           'Cu K\a'
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0320
_diffrn_reflns_av_unetI/netI     0.0361
_diffrn_reflns_Laue_measured_fraction_full 0.9905
_diffrn_reflns_Laue_measured_fraction_max 0.9769
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            9192
_diffrn_reflns_point_group_measured_fraction_full 0.9905
_diffrn_reflns_point_group_measured_fraction_max 0.9769
_diffrn_reflns_theta_full        67.6840
_diffrn_reflns_theta_max         77.61
_diffrn_reflns_theta_min         4.69
_exptl_absorpt_coefficient_mu    0.688
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.828
_exptl_absorpt_correction_type   gaussian
_exptl_absorpt_process_details
;
CrysAlisPro 1.171.42.70a (Rigaku Oxford Diffraction, 2022)
Numerical absorption correction based on gaussian integration over
a multifaceted crystal model
Empirical absorption correction using spherical harmonics,
implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            'clear yellow'
_exptl_crystal_colour_lustre     clear
_exptl_crystal_colour_primary    yellow
_exptl_crystal_density_diffrn    1.355
_exptl_crystal_description       plate
_exptl_crystal_F_000             601.956
_exptl_crystal_size_max          0.169
_exptl_crystal_size_mid          0.13
_exptl_crystal_size_min          0.044
_refine_diff_density_max         0.4147
_refine_diff_density_min         -0.2757
_refine_diff_density_rms         0.0600
_refine_ls_d_res_high            0.7893
_refine_ls_d_res_low             9.4244
_refine_ls_goodness_of_fit_ref   1.0709
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_constraints    0
_refine_ls_number_parameters     325
_refine_ls_number_reflns         2912
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.0709
_refine_ls_R_factor_all          0.0691
_refine_ls_R_factor_gt           0.0538
_refine_ls_shift/su_max          0.0010
_refine_ls_shift/su_mean         0.0000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[σ²(Fo²)+(0.0389P)²+0.2859P] where P=(Fo²+2Fc²)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1169
_refine_ls_wR_factor_ref         0.1250
_reflns_Friedel_coverage         0.0
_reflns_limit_h_max              8
_reflns_limit_h_min              -9
_reflns_limit_k_max              14
_reflns_limit_k_min              0
_reflns_limit_l_max              22
_reflns_limit_l_min              0
_reflns_number_gt                2233
_reflns_number_total             2912
_reflns_threshold_expression     I>=2u(I)
_cod_data_source_file            yc5047.cif
_cod_data_source_block           2oAPb_293K_HAR
_cod_database_code               1571598
_olex2_refinement_description
;
;
_olex2_refine_details
;
Refinement using NoSpherA2, an implementation of
NOn-SPHERical Atom-form-factors in Olex2.
Please cite:
F. Kleemiss et al. Chem. Sci. DOI 10.1039/D0SC05526C - 2021
NoSpherA2 implementation of HAR makes use of
tailor-made aspherical atomic form factors calculated
on-the-fly from a Hirshfeld-partitioned electron density (ED) - not from
spherical-atom form factors.

The ED is calculated from a gaussian basis set single determinant SCF
wavefunction - either Hartree-Fock or DFT using selected funtionals
 - for a fragment of the crystal.
This fragment can be embedded in an electrostatic crystal field by employing
cluster charges
or modelled using implicit solvation models, depending on the software used.
The following options were used:
   SOFTWARE:       ORCA 5.0
   PARTITIONING:   NoSpherA2
   INT ACCURACY:   Normal
   METHOD:         B3LYP
   BASIS SET:      6-31G(d,p)
   CHARGE:         0
   MULTIPLICITY:   1
   DATE:           2024-02-20_11-07-25
;
_olex2_submission_special_instructions 'No special instructions were received'
_oxdiff_exptl_absorpt_empirical_details
;
Empirical correction (ABSPACK) includes:
- Absorption correction using spherical harmonics
- Frame scaling
;
loop_
_space_group_symop_id
_space_group_symop_operation_xyz
1 x,y,z
2 -x,y+1/2,-z+1/2
3 -x,-y,-z
4 x,-y-1/2,z-1/2
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_refinement_flags_posn
O1 O 0.4625(2) 0.56689(14) 0.73715(8) 0.0896(5) Uani 1.000000 .
O2 O 0.2417(4) 0.10489(16) 0.46438(12) 0.1272(8) Uani 1.000000 .
C1 C 0.3192(2) 0.44367(15) 0.63027(9) 0.0514(4) Uani 1.000000 .
C2 C 0.2988(2) 0.52919(14) 0.57021(9) 0.0503(4) Uani 1.000000 .
C3 C 0.3285(3) 0.65399(17) 0.58455(13) 0.0639(5) Uani 1.000000 .
H3 H 0.369(3) 0.6830(19) 0.6427(13) 0.092(7) Uani 1.000000 .
C4 C 0.3121(3) 0.7333(2) 0.52554(14) 0.0729(5) Uani 1.000000 .
H4 H 0.345(4) 0.825(2) 0.5381(14) 0.112(8) Uani 1.000000 .
C5 C 0.2635(2) 0.69653(19) 0.44646(12) 0.0687(5) Uani 1.000000 .
C6 C 0.2537(4) 0.7769(3) 0.3853(2) 0.0912(9) Uani 1.000000 .
H6 H 0.274(5) 0.865(3) 0.395(2) 0.148(13) Uani 1.000000 .
C7 C 0.2076(4) 0.7389(3) 0.30871(18) 0.1013(10) Uani 1.000000 .
H7 H 0.199(4) 0.796(3) 0.2603(15) 0.133(11) Uani 1.000000 .
C8 C 0.1696(3) 0.6197(3) 0.29211(16) 0.0931(8) Uani 1.000000 .
H8 H 0.133(4) 0.592(3) 0.2326(15) 0.139(12) Uani 1.000000 .
C9 C 0.1788(2) 0.5368(2) 0.35140(10) 0.0729(6) Uani 1.000000 .
C10 C 0.1418(3) 0.4136(3) 0.33531(13) 0.0806(7) Uani 1.000000 .
H10 H 0.104(3) 0.388(3) 0.2769(12) 0.122(9) Uani 1.000000 .
C11 C 0.1572(3) 0.3332(2) 0.39290(12) 0.0731(6) Uani 1.000000 .
H11 H 0.130(3) 0.240(3) 0.3786(13) 0.108(9) Uani 1.000000 .
C12 C 0.2132(2) 0.36706(16) 0.47303(9) 0.0558(4) Uani 1.000000 .
C13 C 0.2365(2) 0.28382(16) 0.53442(10) 0.0574(4) Uani 1.000000 .
C14 C 0.2855(2) 0.32505(17) 0.61064(11) 0.0554(4) Uani 1.000000 .
H14 H 0.303(3) 0.2637(17) 0.6563(11) 0.078(6) Uani 1.000000 .
C15 C 0.24529(19) 0.49000(15) 0.49149(9) 0.0513(4) Uani 1.000000 .
C16 C 0.2279(2) 0.57472(17) 0.43006(10) 0.0594(4) Uani 1.000000 .
C17 C 0.3833(2) 0.47385(17) 0.71459(10) 0.0608(4) Uani 1.000000 .
C18 C 0.3543(5) 0.3852(3) 0.77364(16) 0.0838(7) Uani 1.000000 .
H18a H 0.456(6) 0.322(3) 0.778(2) 0.152(14) Uani 1.000000 .
H18b H 0.386(5) 0.424(3) 0.8288(13) 0.150(14) Uani 1.000000 .
H18c H 0.218(5) 0.349(3) 0.7600(18) 0.153(13) Uani 1.000000 .
C19 C 0.2223(3) 0.15201(18) 0.52281(13) 0.0732(5) Uani 1.000000 .
C20 C 0.1871(6) 0.0748(3) 0.58759(18) 0.0881(7) Uani 1.000000 .
H20a H 0.154(5) -0.010(3) 0.5672(19) 0.158(14) Uani 1.000000 .
H20b H 0.315(5) 0.068(3) 0.614(3) 0.20(2) Uani 1.000000 .
H20c H 0.085(6) 0.114(3) 0.614(2) 0.178(17) Uani 1.000000 .
loop_
_atom_type_symbol
_atom_type_scat_dispersion_real
_atom_type_scat_dispersion_imag
_atom_type_scat_source
_atom_type_scat_dispersion_source
C 0.01788 0.00908 'NoSpherA2: Chem.Sci. 2021, DOI:10.1039/D0SC05526C'
'Brennan, Cowan, Rev. Sci. Instrum., 1992, 63, 850'
H 0.00000 0.00000 'NoSpherA2: Chem.Sci. 2021, DOI:10.1039/D0SC05526C'
'Brennan, Cowan, Rev. Sci. Instrum., 1992, 63, 850'
O 0.04960 0.03234 'NoSpherA2: Chem.Sci. 2021, DOI:10.1039/D0SC05526C'
'Brennan, Cowan, Rev. Sci. Instrum., 1992, 63, 850'
loop_
_exptl_crystal_face_index_h
_exptl_crystal_face_index_k
_exptl_crystal_face_index_l
_exptl_crystal_face_perp_dist
0 -7 -1 0.0164
0 7 1 0.0265
2 4 7 0.0715
1 4 9 0.0676
-5 0 2 0.0507
1 -4 -9 0.0585
-5 1 3 0.0519
-3 -3 -6 0.0730
3 -3 -8 0.0758
5 0 -3 0.0798
4 2 2 0.0700
-2 7 0 0.0327
2 -7 0 0.0327
1 -3 9 0.0766
-2 6 -5 0.0489
2 -6 5 0.0489
0 7 -5 0.0467
0 -7 5 0.0467
-3 -4 8 0.0540
-4 1 6 0.0508
-3 3 9 0.0635
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
C14 C1 C2 118.98(15) . . ?
C17 C1 C2 123.33(15) . . ?
C17 C1 C14 117.65(16) . . ?
C3 C2 C1 123.18(15) . . ?
C15 C2 C1 118.75(14) . . ?
C15 C2 C3 118.06(16) . . ?
H3 C3 C2 118.1(12) . . ?
C4 C3 C2 121.6(2) . . ?
C4 C3 H3 120.2(12) . . ?
H4 C4 C3 119.9(13) . . ?
C5 C4 C3 121.6(2) . . ?
C5 C4 H4 118.4(13) . . ?
C6 C5 C4 122.0(2) . . ?
C16 C5 C4 118.36(18) . . ?
C16 C5 C6 119.6(2) . . ?
H6 C6 C5 122(2) . . ?
C7 C6 C5 121.0(3) . . ?
C7 C6 H6 117(2) . . ?
H7 C7 C6 124.0(17) . . ?
C8 C7 C6 119.7(3) . . ?
C8 C7 H7 116.3(17) . . ?
H8 C8 C7 118.7(17) . . ?
C9 C8 C7 121.0(3) . . ?
C9 C8 H8 120.3(17) . . ?
C10 C9 C8 121.7(2) . . ?
C16 C9 C8 119.6(3) . . ?
C16 C9 C10 118.65(19) . . ?
H10 C10 C9 117.1(17) . . ?
C11 C10 C9 121.5(2) . . ?
C11 C10 H10 121.4(17) . . ?
H11 C11 C10 119.5(14) . . ?
C12 C11 C10 121.7(2) . . ?
C12 C11 H11 118.8(14) . . ?
C13 C12 C11 122.69(18) . . ?
C15 C12 C11 118.52(19) . . ?
C15 C12 C13 118.79(14) . . ?
C14 C13 C12 118.83(16) . . ?
C19 C13 C12 123.91(16) . . ?
C19 C13 C14 117.18(18) . . ?
C13 C14 C1 123.61(18) . . ?
H14 C14 C1 117.3(10) . . ?
H14 C14 C13 119.1(10) . . ?
C12 C15 C2 121.02(15) . . ?
C16 C15 C2 119.56(16) . . ?
C16 C15 C12 119.40(15) . . ?
C9 C16 C5 119.01(18) . . ?
C15 C16 C5 120.74(16) . . ?
C15 C16 C9 120.23(19) . . ?
C1 C17 O1 122.35(18) . . ?
C18 C17 O1 118.52(19) . . ?
C18 C17 C1 119.10(19) . . ?
H18a C18 C17 107.7(19) . . ?
H18b C18 C17 109.9(15) . . ?
H18b C18 H18a 103(2) . . ?
H18c C18 C17 112.4(17) . . ?
H18c C18 H18a 112(3) . . ?
H18c C18 H18b 112(2) . . ?
C13 C19 O2 122.5(2) . . ?
C20 C19 O2 118.5(2) . . ?
C20 C19 C13 118.95(19) . . ?
H20a C20 C19 109.6(18) . . ?
H20b C20 C19 96(3) . . ?
H20b C20 H20a 103(3) . . ?
H20c C20 C19 110.6(18) . . ?
H20c C20 H20a 115(3) . . ?
H20c C20 H20b 121(4) . . ?
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
O1 C17 1.215(2) . ?
O2 C19 1.202(2) . ?
C1 C2 1.417(2) . ?
C1 C14 1.387(2) . ?
C1 C17 1.496(2) . ?
C2 C3 1.435(2) . ?
C2 C15 1.428(2) . ?
C3 H3 1.06(2) . ?
C3 C4 1.359(3) . ?
C4 H4 1.07(2) . ?
C4 C5 1.424(3) . ?
C5 C6 1.401(3) . ?
C5 C16 1.413(3) . ?
C6 H6 1.01(4) . ?
C6 C7 1.388(5) . ?
C7 H7 1.06(2) . ?
C7 C8 1.387(4) . ?
C8 H8 1.07(3) . ?
C8 C9 1.396(3) . ?
C9 C10 1.428(3) . ?
C9 C16 1.421(3) . ?
C10 H10 1.05(2) . ?
C10 C11 1.350(3) . ?
C11 H11 1.08(3) . ?
C11 C12 1.434(2) . ?
C12 C13 1.416(2) . ?
C12 C15 1.428(2) . ?
C13 C14 1.393(2) . ?
C13 C19 1.498(3) . ?
C14 H14 1.05(2) . ?
C15 C16 1.431(2) . ?
C17 C18 1.497(3) . ?
C18 H18a 1.01(4) . ?
C18 H18b 1.04(2) . ?
C18 H18c 1.04(3) . ?
C19 C20 1.509(4) . ?
C20 H20a 1.03(3) . ?
C20 H20b 0.94(3) . ?
C20 H20c 1.06(3) . ?
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 C17 C1 C2 -17.0(2) . . . . ?
O1 C17 C1 C14 160.50(18) . . . . ?
O2 C19 C13 C12 20.9(3) . . . . ?
O2 C19 C13 C14 -155.6(2) . . . . ?
C1 C2 C3 C4 178.40(17) . . . . ?
C1 C2 C15 C12 -0.20(17) . . . . ?
C1 C2 C15 C16 -178.66(13) . . . . ?
C1 C14 C13 C12 -2.2(2) . . . . ?
C1 C14 C13 C19 174.51(17) . . . . ?
C2 C3 C4 C5 0.4(2) . . . . ?
C2 C15 C12 C11 179.15(15) . . . . ?
C2 C15 C12 C13 -0.35(16) . . . . ?
C2 C15 C16 C5 0.13(16) . . . . ?
C2 C15 C16 C9 178.64(14) . . . . ?
C3 C4 C5 C6 -177.4(2) . . . . ?
C3 C4 C5 C16 1.4(2) . . . . ?
C4 C5 C6 C7 179.5(2) . . . . ?
C4 C5 C16 C9 179.81(16) . . . . ?
C4 C5 C16 C15 -1.65(19) . . . . ?
C5 C6 C7 C8 0.3(3) . . . . ?
C5 C16 C9 C8 1.02(19) . . . . ?
C5 C16 C9 C10 -179.58(17) . . . . ?
C5 C16 C15 C12 -178.36(15) . . . . ?
C6 C7 C8 C9 -0.7(3) . . . . ?
C7 C8 C9 C10 -179.4(2) . . . . ?
C7 C8 C9 C16 -0.0(3) . . . . ?
C8 C9 C10 C11 177.7(2) . . . . ?
C8 C9 C16 C15 -177.51(16) . . . . ?
C9 C10 C11 C12 -0.6(2) . . . . ?
C9 C16 C15 C12 0.15(17) . . . . ?
C10 C11 C12 C13 -177.86(18) . . . . ?
C10 C11 C12 C15 2.7(2) . . . . ?
C11 C12 C13 C14 -178.00(17) . . . . ?
C11 C12 C13 C19 5.5(2) . . . . ?
C11 C12 C15 C16 -2.38(18) . . . . ?
C12 C13 C19 C20 -160.7(2) . . . . ?
