# Electronic Supplementary Material (ESI) for ChemComm.
# This journal is © The Royal Society of Chemistry 2016

####################################################################### 
# 
# 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_151105_zbb_3
_database_code_depnum_ccdc_archive 'CCDC 1496549'
_audit_update_record             
;
2016-07-28 deposited with the CCDC.
2016-09-29 downloaded from the CCDC.
;
_audit_creation_date             2015-11-06
_audit_creation_method           
;
Olex2 1.2
(compiled 2014.03.20 svn.r2914 for OlexSys, GUI svn.r4816)
;
_chemical_name_common            ?
_chemical_name_systematic        
;
 ? 
;
_chemical_formula_moiety         'C24 H17 N O'
_chemical_formula_sum            'C24 H17 N O'
_chemical_formula_weight         335.39
_chemical_absolute_configuration unk
_chemical_melting_point          ?
_chemical_oxdiff_formula         'c10 h10 n2 o8'
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'

_space_group_crystal_system      orthorhombic
_space_group_IT_number           33
_space_group_name_H-M_alt        'P n a 21'
_space_group_name_Hall           'P 2c -2n'
loop_
_space_group_symop_id
_space_group_symop_operation_xyz
1 'x, y, z'
2 '-x, -y, z+1/2'
3 '-x+1/2, y+1/2, z+1/2'
4 'x+1/2, -y+1/2, z'

_cell_length_a                   15.3015(18)
_cell_length_b                   12.1976(10)
_cell_length_c                   9.6252(8)
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_volume                     1796.5(3)
_cell_formula_units_Z            4
_cell_measurement_reflns_used    1104
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      29.5288
_cell_measurement_theta_min      3.0006
_exptl_absorpt_coefficient_mu    0.075
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.98598
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   
;
CrysAlisPro, Agilent Technologies,
Version 1.171.35.11 (release 16-05-2011 CrysAlis171 .NET)
(compiled May 16 2011,17:55:39)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            yellow
_exptl_crystal_colour_primary    yellow
_exptl_crystal_density_diffrn    1.240
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             704
_exptl_crystal_size_max          0.49
_exptl_crystal_size_mid          0.46
_exptl_crystal_size_min          0.32
_exptl_special_details           
;
 ? 
;
_diffrn_reflns_av_R_equivalents  0.0357
_diffrn_reflns_av_unetI/netI     0.0352
_diffrn_reflns_limit_h_max       18
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       -11
_diffrn_reflns_number            5078
_diffrn_reflns_theta_full        25.33
_diffrn_reflns_theta_max         25.33
_diffrn_reflns_theta_min         3.01
_diffrn_ambient_temperature      293.15
_diffrn_detector_area_resol_mean 10.3592
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Xcalibur, Atlas, Gemini ultra'
_diffrn_measurement_method       'ω scans'
_diffrn_orient_matrix_UB_11      0.0210597000
_diffrn_orient_matrix_UB_12      0.0320328000
_diffrn_orient_matrix_UB_13      0.0515564000
_diffrn_orient_matrix_UB_21      0.0388332000
_diffrn_orient_matrix_UB_22      -0.0308972000
_diffrn_orient_matrix_UB_23      -0.0092163000
_diffrn_orient_matrix_UB_31      0.0140527000
_diffrn_orient_matrix_UB_32      0.0374296000
_diffrn_orient_matrix_UB_33      -0.0518323000
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_source                   'Enhance (Mo) X-ray Source'
_diffrn_standards_decay_%        ?
_diffrn_standards_interval_count ?
_diffrn_standards_interval_time  ?
_diffrn_standards_number         ?
_reflns_number_gt                1347
_reflns_number_total             1750
_reflns_odcompleteness_completeness 99.58
_reflns_odcompleteness_iscentric 1
_reflns_odcompleteness_theta     26.32
_reflns_threshold_expression     >2sigma(I)
_computing_cell_refinement       
;
CrysAlisPro, Agilent Technologies,
Version 1.171.35.11 (release 16-05-2011 CrysAlis171 .NET)
(compiled May 16 2011,17:55:39)
;
_computing_data_collection       
;
CrysAlisPro, Agilent Technologies,
Version 1.171.35.11 (release 16-05-2011 CrysAlis171 .NET)
(compiled May 16 2011,17:55:39)
;
_computing_data_reduction        
;
CrysAlisPro, Agilent Technologies,
Version 1.171.35.11 (release 16-05-2011 CrysAlis171 .NET)
(compiled May 16 2011,17:55:39)
;
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'ShelXL (Sheldrick, 2008)'
_computing_structure_solution    'ShelXS (Sheldrick, 2008)'
_refine_diff_density_max         0.118
_refine_diff_density_min         -0.141
_refine_diff_density_rms         0.032
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -1(2)
_refine_ls_extinction_coef       ?
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.048
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     236
_refine_ls_number_reflns         1750
_refine_ls_number_restraints     1
_refine_ls_R_factor_all          0.0568
_refine_ls_R_factor_gt           0.0376
_refine_ls_restrained_S_all      1.048
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details     
'calc w=1/[σ²(Fo²)+(0.0399P)²+0.0000P] where P=(Fo²+2Fc²)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0747
_refine_ls_wR_factor_ref         0.0824
_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. 
;
_olex2_refinement_description    
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2.a Ternary CH refined with riding coordinates:
 C9(H9)
2.b Aromatic/amide H refined with riding coordinates:
 C1(H1), C2(H2), C3(H3), C4(H4), C12(H12), C13(H13), C14(H14), C15(H15),
 C20(H20), C21(H21), C22(H22), C23(H23), C24(H24)
2.c Idealised Me refined as rotating group:
 C16(H16A,H16B,H16C)
;
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
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_calc_flag
_atom_site_disorder_assembly
_atom_site_disorder_group
_atom_site_refinement_flags_posn
O1 O 0.84930(15) 0.81249(17) 0.5899(2) 0.0638(6) Uani 1 d . . .
N1 N 0.89893(14) 0.86721(17) 0.3737(2) 0.0407(5) Uani 1 d . . .
C1 C 0.71028(18) 0.9949(2) 0.5398(3) 0.0524(8) Uani 1 d . . .
H1 H 0.6961 0.9599 0.6226 0.063 Uiso 1 calc . . R
C2 C 0.6639(2) 1.0852(3) 0.4952(3) 0.0586(8) Uani 1 d . . .
H2 H 0.6180 1.1117 0.5488 0.070 Uiso 1 calc . . R
C3 C 0.6849(2) 1.1368(3) 0.3715(3) 0.0574(8) Uani 1 d . . .
H3 H 0.6530 1.1977 0.3432 0.069 Uiso 1 calc . . R
C4 C 0.75225(19) 1.0994(2) 0.2901(3) 0.0500(7) Uani 1 d . . .
H4 H 0.7658 1.1343 0.2069 0.060 Uiso 1 calc . . R
C5 C 0.79984(18) 1.0087(2) 0.3337(3) 0.0404(6) Uani 1 d . . .
C6 C 0.77865(17) 0.9577(2) 0.4579(3) 0.0422(6) Uani 1 d . . .
C7 C 0.84310(18) 0.8700(2) 0.4868(3) 0.0447(7) Uani 1 d . . .
C8 C 0.87545(19) 0.9505(2) 0.2665(3) 0.0420(7) Uani 1 d . . .
C9 C 0.96284(18) 1.0158(2) 0.2449(3) 0.0441(7) Uani 1 d . . .
H9 H 0.9734 1.0259 0.1453 0.053 Uiso 1 calc . . R
C10 C 1.03114(18) 0.9378(2) 0.3046(3) 0.0416(7) Uani 1 d . . .
C11 C 0.99075(17) 0.8555(2) 0.3806(3) 0.0388(6) Uani 1 d . . .
C12 C 1.0387(2) 0.7783(2) 0.4539(3) 0.0503(7) Uani 1 d . . .
H12 H 1.0114 0.7240 0.5060 0.060 Uiso 1 calc . . R
C13 C 1.1292(2) 0.7854(2) 0.4462(4) 0.0598(8) Uani 1 d . . .
H13 H 1.1632 0.7351 0.4945 0.072 Uiso 1 calc . . R
C14 C 1.1692(2) 0.8649(3) 0.3689(4) 0.0651(9) Uani 1 d . . .
H14 H 1.2299 0.8667 0.3637 0.078 Uiso 1 calc . . R
C15 C 1.1205(2) 0.9432(2) 0.2982(3) 0.0551(8) Uani 1 d . . .
H15 H 1.1480 0.9981 0.2474 0.066 Uiso 1 calc . . R
C16 C 0.8494(2) 0.8924(2) 0.1319(3) 0.0593(9) Uani 1 d . . .
H16A H 0.8017 0.8433 0.1500 0.089 Uiso 1 calc . . GR
H16B H 0.8984 0.8515 0.0971 0.089 Uiso 1 calc . . GR
H16C H 0.8319 0.9458 0.0642 0.089 Uiso 1 calc . . GR
C17 C 0.96286(17) 1.1226(2) 0.3142(3) 0.0449(7) Uani 1 d . . .
C18 C 0.95381(19) 1.2096(2) 0.3693(3) 0.0480(7) Uani 1 d . . .
C19 C 0.93833(17) 1.3153(2) 0.4308(3) 0.0419(7) Uani 1 d . . .
C20 C 0.9200(2) 1.3272(2) 0.5704(3) 0.0527(8) Uani 1 d . . .
H20 H 0.9191 1.2657 0.6275 0.063 Uiso 1 calc . . R
C21 C 0.9032(2) 1.4285(3) 0.6261(4) 0.0608(8) Uani 1 d . . .
H21 H 0.8907 1.4352 0.7202 0.073 Uiso 1 calc . . R
C22 C 0.9047(2) 1.5203(3) 0.5432(4) 0.0602(9) Uani 1 d . . .
H22 H 0.8931 1.5889 0.5812 0.072 Uiso 1 calc . . R
C23 C 0.9233(2) 1.5105(2) 0.4048(3) 0.0581(9) Uani 1 d . . .
H23 H 0.9244 1.5725 0.3486 0.070 Uiso 1 calc . . R
C24 C 0.9406(2) 1.4090(2) 0.3482(3) 0.0508(8) Uani 1 d . . .
H24 H 0.9538 1.4030 0.2542 0.061 Uiso 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
O1 C7 1.219(3) . ?
N1 C7 1.384(4) . ?
N1 C8 1.492(3) . ?
N1 C11 1.414(3) . ?
C1 H1 0.9300 . ?
C1 C2 1.379(4) . ?
C1 C6 1.386(4) . ?
C2 H2 0.9300 . ?
C2 C3 1.384(4) . ?
C3 H3 0.9300 . ?
C3 C4 1.373(4) . ?
C4 H4 0.9300 . ?
C4 C5 1.390(4) . ?
C5 C6 1.386(4) . ?
C5 C8 1.504(4) . ?
C6 C7 1.481(4) . ?
C8 C9 1.570(4) . ?
C8 C16 1.529(4) . ?
C9 H9 0.9800 . ?
C9 C10 1.525(4) . ?
C9 C17 1.464(4) . ?
C10 C11 1.387(4) . ?
C10 C15 1.370(4) . ?
C11 C12 1.387(4) . ?
C12 H12 0.9300 . ?
C12 C13 1.389(4) . ?
C13 H13 0.9300 . ?
C13 C14 1.367(5) . ?
C14 H14 0.9300 . ?
C14 C15 1.389(4) . ?
C15 H15 0.9300 . ?
C16 H16A 0.9600 . ?
C16 H16B 0.9600 . ?
C16 H16C 0.9600 . ?
C17 C18 1.194(4) . ?
C18 C19 1.438(4) . ?
C19 C20 1.381(4) . ?
C19 C24 1.393(4) . ?
C20 H20 0.9300 . ?
C20 C21 1.372(4) . ?
C21 H21 0.9300 . ?
C21 C22 1.374(4) . ?
C22 H22 0.9300 . ?
C22 C23 1.368(4) . ?
C23 H23 0.9300 . ?
C23 C24 1.378(4) . ?
C24 H24 0.9300 . ?

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 N1 C8 112.2(2) . . ?
C7 N1 C11 125.4(2) . . ?
C11 N1 C8 109.9(2) . . ?
C2 C1 H1 120.9 . . ?
C2 C1 C6 118.2(3) . . ?
C6 C1 H1 120.9 . . ?
C1 C2 H2 119.6 . . ?
C1 C2 C3 120.8(3) . . ?
C3 C2 H2 119.6 . . ?
C2 C3 H3 119.5 . . ?
C4 C3 C2 121.0(3) . . ?
C4 C3 H3 119.5 . . ?
C3 C4 H4 120.5 . . ?
C3 C4 C5 119.0(3) . . ?
C5 C4 H4 120.5 . . ?
C4 C5 C8 130.5(2) . . ?
C6 C5 C4 119.7(3) . . ?
C6 C5 C8 109.9(2) . . ?
C1 C6 C7 129.2(3) . . ?
C5 C6 C1 121.4(2) . . ?
C5 C6 C7 109.3(2) . . ?
O1 C7 N1 125.3(3) . . ?
O1 C7 C6 128.4(3) . . ?
N1 C7 C6 106.3(2) . . ?
N1 C8 C5 102.1(2) . . ?
N1 C8 C9 103.4(2) . . ?
N1 C8 C16 109.4(2) . . ?
C5 C8 C9 118.2(2) . . ?
C5 C8 C16 112.5(2) . . ?
C16 C8 C9 110.2(2) . . ?
C8 C9 H9 109.5 . . ?
C10 C9 C8 102.6(2) . . ?
C10 C9 H9 109.5 . . ?
C17 C9 C8 113.0(2) . . ?
C17 C9 H9 109.5 . . ?
C17 C9 C10 112.5(2) . . ?
C11 C10 C9 110.1(2) . . ?
C15 C10 C9 129.6(2) . . ?
C15 C10 C11 120.2(3) . . ?
C10 C11 N1 110.2(2) . . ?
C12 C11 N1 128.2(2) . . ?
C12 C11 C10 121.6(2) . . ?
C11 C12 H12 121.4 . . ?
C11 C12 C13 117.2(3) . . ?
C13 C12 H12 121.4 . . ?
C12 C13 H13 119.3 . . ?
C14 C13 C12 121.3(3) . . ?
C14 C13 H13 119.3 . . ?
C13 C14 H14 119.6 . . ?
C13 C14 C15 120.9(3) . . ?
C15 C14 H14 119.6 . . ?
C10 C15 C14 118.7(3) . . ?
C10 C15 H15 120.6 . . ?
C14 C15 H15 120.6 . . ?
C8 C16 H16A 109.5 . . ?
C8 C16 H16B 109.5 . . ?
C8 C16 H16C 109.5 . . ?
H16A C16 H16B 109.5 . . ?
H16A C16 H16C 109.5 . . ?
H16B C16 H16C 109.5 . . ?
C18 C17 C9 173.3(3) . . ?
C17 C18 C19 176.6(3) . . ?
C20 C19 C18 121.9(3) . . ?
C20 C19 C24 118.3(3) . . ?
C24 C19 C18 119.8(3) . . ?
C19 C20 H20 119.6 . . ?
C21 C20 C19 120.8(3) . . ?
C21 C20 H20 119.6 . . ?
C20 C21 H21 119.8 . . ?
C20 C21 C22 120.3(3) . . ?
C22 C21 H21 119.8 . . ?
C21 C22 H22 120.1 . . ?
C23 C22 C21 119.8(3) . . ?
C23 C22 H22 120.1 . . ?
C22 C23 H23 119.9 . . ?
C22 C23 C24 120.2(3) . . ?
C24 C23 H23 119.9 . . ?
C19 C24 H24 119.8 . . ?
C23 C24 C19 120.5(3) . . ?
C23 C24 H24 119.8 . . ?

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
N1 C8 C9 C10 18.5(2) . . . . ?
N1 C8 C9 C17 -102.9(2) . . . . ?
N1 C11 C12 C13 -178.7(3) . . . . ?
C1 C2 C3 C4 0.1(4) . . . . ?
C1 C6 C7 O1 -0.3(5) . . . . ?
C1 C6 C7 N1 -178.4(3) . . . . ?
C2 C1 C6 C5 -0.6(4) . . . . ?
C2 C1 C6 C7 174.1(3) . . . . ?
C2 C3 C4 C5 -0.3(4) . . . . ?
C3 C4 C5 C6 0.0(4) . . . . ?
C3 C4 C5 C8 179.7(3) . . . . ?
C4 C5 C6 C1 0.4(4) . . . . ?
C4 C5 C6 C7 -175.2(2) . . . . ?
C4 C5 C8 N1 175.5(3) . . . . ?
C4 C5 C8 C9 63.0(4) . . . . ?
C4 C5 C8 C16 -67.3(4) . . . . ?
C5 C6 C7 O1 174.9(3) . . . . ?
C5 C6 C7 N1 -3.2(3) . . . . ?
C5 C8 C9 C10 130.3(2) . . . . ?
C5 C8 C9 C17 8.9(3) . . . . ?
C6 C1 C2 C3 0.3(4) . . . . ?
C6 C5 C8 N1 -4.7(3) . . . . ?
C6 C5 C8 C9 -117.3(3) . . . . ?
C6 C5 C8 C16 112.4(2) . . . . ?
C7 N1 C8 C5 2.8(3) . . . . ?
C7 N1 C8 C9 126.0(2) . . . . ?
C7 N1 C8 C16 -116.6(3) . . . . ?
C7 N1 C11 C10 -128.0(3) . . . . ?
C7 N1 C11 C12 49.7(4) . . . . ?
C8 N1 C7 O1 -178.1(3) . . . . ?
C8 N1 C7 C6 0.1(3) . . . . ?
C8 N1 C11 C10 10.6(3) . . . . ?
C8 N1 C11 C12 -171.6(3) . . . . ?
C8 C5 C6 C1 -179.3(2) . . . . ?
C8 C5 C6 C7 5.1(3) . . . . ?
C8 C9 C10 C11 -13.5(3) . . . . ?
C8 C9 C10 C15 170.2(3) . . . . ?
C8 C9 C17 C18 -27(3) . . . . ?
C9 C10 C11 N1 2.5(3) . . . . ?
C9 C10 C11 C12 -175.4(2) . . . . ?
C9 C10 C15 C14 176.0(3) . . . . ?
C9 C17 C18 C19 -29(7) . . . . ?
C10 C9 C17 C18 -143(2) . . . . ?
C10 C11 C12 C13 -1.1(4) . . . . ?
C11 N1 C7 O1 -40.3(4) . . . . ?
C11 N1 C7 C6 137.9(2) . . . . ?
C11 N1 C8 C5 -141.6(2) . . . . ?
C11 N1 C8 C9 -18.4(3) . . . . ?
C11 N1 C8 C16 99.0(3) . . . . ?
C11 C10 C15 C14 0.0(4) . . . . ?
C11 C12 C13 C14 -0.3(5) . . . . ?
C12 C13 C14 C15 1.6(5) . . . . ?
C13 C14 C15 C10 -1.4(5) . . . . ?
C15 C10 C11 N1 179.3(2) . . . . ?
C15 C10 C11 C12 1.3(4) . . . . ?
C16 C8 C9 C10 -98.4(2) . . . . ?
C16 C8 C9 C17 140.2(2) . . . . ?
C17 C9 C10 C11 108.3(3) . . . . ?
C17 C9 C10 C15 -68.1(4) . . . . ?
C17 C18 C19 C20 116(5) . . . . ?
C17 C18 C19 C24 -63(5) . . . . ?
C18 C19 C20 C21 -178.3(3) . . . . ?
C18 C19 C24 C23 178.1(3) . . . . ?
C19 C20 C21 C22 -0.3(5) . . . . ?
C20 C19 C24 C23 -1.1(4) . . . . ?
C20 C21 C22 C23 -0.2(5) . . . . ?
C21 C22 C23 C24 0.0(5) . . . . ?
C22 C23 C24 C19 0.7(5) . . . . ?
C24 C19 C20 C21 0.9(4) . . . . ?

