# Electronic Supplementary Material (ESI) for Organic Chemistry Frontiers.
# This journal is © the Partner Organisations 2018

####################################################################### 
# 
# 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_shelxl
_database_code_depnum_ccdc_archive 'CCDC 1529064'
_audit_update_record             
;
2017-01-23 deposited with the CCDC.
2018-11-28 downloaded from the CCDC.
;

_audit_creation_method           SHELXL-2016/6
_shelx_SHELXL_version_number     2016/6
_chemical_name_systematic        ?
_chemical_name_common            ?
_chemical_melting_point          ?
_chemical_formula_moiety         'C22 H21 N O5'
_chemical_formula_sum            'C22 H21 N O5'
_chemical_formula_weight         379.40

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           18
_space_group_name_H-M_alt        'P 21 21 2'
_space_group_name_Hall           'P 2 2ab'

_shelx_space_group_comment       
;
The symmetry employed for this shelxl refinement is uniquely defined
by the following loop, which should always be used as a source of
symmetry information in preference to the above space-group names.
They are only intended as comments.
;

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

_cell_length_a                   21.2879(7)
_cell_length_b                   7.5138(4)
_cell_length_c                   11.5723(6)
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_volume                     1851.02(15)
_cell_formula_units_Z            4
_cell_measurement_temperature    100(2)
_cell_measurement_reflns_used    10358
_cell_measurement_theta_min      1.99
_cell_measurement_theta_max      31.29

_exptl_crystal_description       needle
_exptl_crystal_colour            red
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_density_diffrn    1.361
_exptl_crystal_F_000             800
_exptl_transmission_factor_min   ?
_exptl_transmission_factor_max   ?
_exptl_crystal_size_max          0.150
_exptl_crystal_size_mid          0.050
_exptl_crystal_size_min          0.030
_exptl_absorpt_coefficient_mu    0.097
_shelx_estimated_absorpt_T_min   0.986
_shelx_estimated_absorpt_T_max   0.997
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   
;
CrysAlisPro 1.171.38.41 (Rigaku Oxford Diffraction, 2015)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_absorpt_correction_T_min  0.855
_exptl_absorpt_correction_T_max  0.997
_exptl_absorpt_special_details   ?
_diffrn_ambient_temperature      100(2)
_diffrn_radiation_wavelength     0.71075
_diffrn_radiation_type           MoK\a
_diffrn_source                   'Varimax 50 kV 24 mA Rotating anode'
_diffrn_measurement_device_type  'Rigaku Saturn724'
_diffrn_measurement_method       ω
_diffrn_detector_area_resol_mean 7.111
_diffrn_reflns_number            31866
_diffrn_reflns_av_unetI/netI     0.0449
_diffrn_reflns_av_R_equivalents  0.0712
_diffrn_reflns_limit_h_min       -28
_diffrn_reflns_limit_h_max       28
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_theta_min         1.913
_diffrn_reflns_theta_max         27.999
_diffrn_reflns_theta_full        25.242
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measured_fraction_theta_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 1.000
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 1.000
_diffrn_reflns_point_group_measured_fraction_full 1.000
_reflns_number_total             4466
_reflns_number_gt                3850
_reflns_threshold_expression     'I > 2σ(I)'
_reflns_Friedel_coverage         0.745
_reflns_Friedel_fraction_max     1.000
_reflns_Friedel_fraction_full    1.000

_reflns_special_details          
;
 Reflections were merged by SHELXL according to the crystal
 class for the calculation of statistics and refinement.
 
 _reflns_Friedel_fraction is defined as the number of unique
 Friedel pairs measured divided by the number that would be
 possible theoretically, ignoring centric projections and
 systematic absences.
;

_computing_data_collection       'CrystalClear (Rigaku Inc., 2008)'
_computing_cell_refinement       'CrysAlisPro 1.171.38.41 (Rigaku OD, 2015)'
_computing_data_reduction        'CrysAlisPro 1.171.38.41 (Rigaku OD, 2015)'
_computing_structure_solution    'SIR2011 (Burla, et al., 2012)'
_computing_structure_refinement  'SHELXL-2016/6 (Sheldrick, 2016)'
_computing_molecular_graphics    'CrystalStructure 4.2.2 (Rigaku, 2016)'
_computing_publication_material  'CrystalStructure 4.2.2 (Rigaku, 2016)'
_refine_special_details          ?
_refine_ls_structure_factor_coef Fsqd
_refine_ls_matrix_type           full
_refine_ls_weighting_scheme      calc
_refine_ls_weighting_details     
'w=1/[σ²(Fo²)+(0.0497P)²+0.6561P] where P=(Fo²+2Fc²)/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_abs_structure_details 
;
 Flack x determined using 1405 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   1.9(7)
_chemical_absolute_configuration .
_refine_ls_number_reflns         4466
_refine_ls_number_parameters     257
_refine_ls_number_restraints     0
_refine_ls_R_factor_all          0.0612
_refine_ls_R_factor_gt           0.0492
_refine_ls_wR_factor_ref         0.1087
_refine_ls_wR_factor_gt          0.1036
_refine_ls_goodness_of_fit_ref   1.028
_refine_ls_restrained_S_all      1.028
_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_site_symmetry_order
_atom_site_calc_flag
_atom_site_refinement_flags_posn
_atom_site_refinement_flags_adp
_atom_site_refinement_flags_occupancy
_atom_site_disorder_assembly
_atom_site_disorder_group
O1 O 0.60788(9) 0.6282(3) 0.67406(17) 0.0246(5) Uani 1 1 d . . . . .
O2 O 0.53943(9) 0.6972(3) 0.53533(17) 0.0247(5) Uani 1 1 d . . . . .
O3 O 0.39020(9) 0.9328(3) 0.33919(17) 0.0225(5) Uani 1 1 d . . . . .
O4 O 0.22581(9) 0.6027(3) 0.4684(2) 0.0288(5) Uani 1 1 d . . . . .
O5 O 0.32503(9) 0.9937(3) 0.88046(18) 0.0272(5) Uani 1 1 d . . . . .
N1 N 0.30232(10) 0.7667(3) 0.37994(19) 0.0193(5) Uani 1 1 d . . . . .
C1 C 0.50698(11) 0.7414(4) 0.7250(2) 0.0157(5) Uani 1 1 d . . . . .
C2 C 0.44839(11) 0.8169(4) 0.6941(2) 0.0158(5) Uani 1 1 d . . . . .
C3 C 0.41527(11) 0.8601(4) 0.7948(2) 0.0170(5) Uani 1 1 d . . . . .
C4 C 0.45236(12) 0.8102(4) 0.8925(2) 0.0168(5) Uani 1 1 d . . . . .
C5 C 0.43579(12) 0.8354(4) 1.0068(2) 0.0194(6) Uani 1 1 d . . . . .
H5 H 0.396251 0.890496 1.019924 0.023 Uiso 1 1 calc R U . . .
C6 C 0.46987(12) 0.7901(4) 1.1050(2) 0.0222(6) Uani 1 1 d . . . . .
H6 H 0.449716 0.814605 1.176476 0.027 Uiso 1 1 calc R U . . .
C7 C 0.52912(13) 0.7143(4) 1.1134(2) 0.0233(6) Uani 1 1 d . . . . .
H7 H 0.542678 0.692685 1.190365 0.028 Uiso 1 1 calc R U . . .
C8 C 0.57245(12) 0.6640(4) 1.0283(2) 0.0179(5) Uani 1 1 d . . . . .
C9 C 0.56257(12) 0.6725(4) 0.9098(2) 0.0168(6) Uani 1 1 d . . . . .
H9 H 0.596256 0.629337 0.863861 0.020 Uiso 1 1 calc R U . . .
C10 C 0.51072(11) 0.7347(4) 0.8479(2) 0.0165(6) Uani 1 1 d . . . . .
C11 C 0.55676(12) 0.6818(4) 0.6464(2) 0.0166(5) Uani 1 1 d . . . . .
C12 C 0.58661(14) 0.6542(5) 0.4505(2) 0.0294(7) Uani 1 1 d . . . . .
H12A H 0.627936 0.691590 0.478802 0.035 Uiso 1 1 calc R U . . .
H12B H 0.577185 0.716306 0.378051 0.035 Uiso 1 1 calc R U . . .
H12C H 0.586779 0.525471 0.436869 0.035 Uiso 1 1 calc R U . . .
C13 C 0.42661(12) 0.8537(4) 0.5762(2) 0.0166(5) Uani 1 1 d . . . . .
H13 H 0.455236 0.913851 0.526774 0.020 Uiso 1 1 calc R U . . .
C14 C 0.37112(11) 0.8120(3) 0.5311(2) 0.0163(5) Uani 1 1 d . . . . .
C15 C 0.35853(12) 0.8502(4) 0.4069(2) 0.0168(5) Uani 1 1 d . . . . .
C16 C 0.27485(12) 0.6831(4) 0.4728(3) 0.0200(6) Uani 1 1 d . . . . .
C17 C 0.31571(12) 0.7110(4) 0.5775(2) 0.0193(6) Uani 1 1 d . . . . .
H17A H 0.293379 0.780927 0.637279 0.023 Uiso 1 1 calc R U . . .
H17B H 0.328932 0.595813 0.611166 0.023 Uiso 1 1 calc R U . . .
C18 C 0.27243(14) 0.7781(5) 0.2669(2) 0.0275(7) Uani 1 1 d . . . . .
H18A H 0.270233 0.659147 0.232390 0.033 Uiso 1 1 calc R U . . .
H18B H 0.297053 0.856656 0.216763 0.033 Uiso 1 1 calc R U . . .
H18C H 0.229881 0.826076 0.275595 0.033 Uiso 1 1 calc R U . . .
C19 C 0.35724(12) 0.9623(4) 0.7960(3) 0.0197(6) Uani 1 1 d . . . . .
H19 H 0.343174 1.008723 0.724140 0.024 Uiso 1 1 calc R U . . .
C20 C 0.63545(12) 0.5980(4) 1.0744(2) 0.0203(6) Uani 1 1 d . . . . .
H20 H 0.626343 0.504656 1.133691 0.024 Uiso 1 1 calc R U . . .
C21 C 0.67075(13) 0.7488(4) 1.1355(3) 0.0267(7) Uani 1 1 d . . . . .
H21A H 0.680429 0.842979 1.079647 0.032 Uiso 1 1 calc R U . . .
H21B H 0.709908 0.702454 1.168295 0.032 Uiso 1 1 calc R U . . .
H21C H 0.644504 0.797369 1.197459 0.032 Uiso 1 1 calc R U . . .
C22 C 0.67862(12) 0.5142(4) 0.9840(2) 0.0234(6) Uani 1 1 d . . . . .
H22A H 0.656474 0.416905 0.944964 0.028 Uiso 1 1 calc R U . . .
H22B H 0.716333 0.467482 1.021910 0.028 Uiso 1 1 calc R U . . .
H22C H 0.690740 0.604462 0.927056 0.028 Uiso 1 1 calc R U . . .


_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 C11 1.204(3) . ?
O2 C11 1.342(3) . ?
O2 C12 1.441(3) . ?
O3 C15 1.206(3) . ?
O4 C16 1.207(3) . ?
O5 C19 1.217(3) . ?
N1 C16 1.375(4) . ?
N1 C15 1.387(3) . ?
N1 C18 1.457(3) . ?
C1 C2 1.416(4) . ?
C1 C10 1.425(4) . ?
C1 C11 1.467(4) . ?
C2 C3 1.401(4) . ?
C2 C13 1.467(4) . ?
C3 C4 1.429(4) . ?
C3 C19 1.455(4) . ?
C4 C5 1.382(4) . ?
C4 C10 1.460(4) . ?
C5 C6 1.390(4) . ?
C5 H5 0.9500 . ?
C6 C7 1.388(4) . ?
C6 H6 0.9500 . ?
C7 C8 1.401(4) . ?
C7 H7 0.9500 . ?
C8 C9 1.389(4) . ?
C8 C20 1.526(4) . ?
C9 C10 1.397(4) . ?
C9 H9 0.9500 . ?
C12 H12A 0.9800 . ?
C12 H12B 0.9800 . ?
C12 H12C 0.9800 . ?
C13 C14 1.329(4) . ?
C13 H13 0.9500 . ?
C14 C15 1.490(4) . ?
C14 C17 1.502(4) . ?
C16 C17 1.507(4) . ?
C17 H17A 0.9900 . ?
C17 H17B 0.9900 . ?
C18 H18A 0.9800 . ?
C18 H18B 0.9800 . ?
C18 H18C 0.9800 . ?
C19 H19 0.9500 . ?
C20 C22 1.529(4) . ?
C20 C21 1.532(4) . ?
C20 H20 1.0000 . ?
C21 H21A 0.9800 . ?
C21 H21B 0.9800 . ?
C21 H21C 0.9800 . ?
C22 H22A 0.9800 . ?
C22 H22B 0.9800 . ?
C22 H22C 0.9800 . ?

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
C11 O2 C12 116.2(2) . . ?
C16 N1 C15 113.4(2) . . ?
C16 N1 C18 122.8(2) . . ?
C15 N1 C18 123.5(2) . . ?
C2 C1 C10 108.4(2) . . ?
C2 C1 C11 127.0(2) . . ?
C10 C1 C11 124.6(2) . . ?
C3 C2 C1 109.0(2) . . ?
C3 C2 C13 124.8(2) . . ?
C1 C2 C13 126.1(2) . . ?
C2 C3 C4 108.6(2) . . ?
C2 C3 C19 123.9(2) . . ?
C4 C3 C19 126.9(3) . . ?
C5 C4 C3 125.4(2) . . ?
C5 C4 C10 127.5(3) . . ?
C3 C4 C10 107.0(2) . . ?
C4 C5 C6 128.0(3) . . ?
C4 C5 H5 116.0 . . ?
C6 C5 H5 116.0 . . ?
C7 C6 C5 129.2(3) . . ?
C7 C6 H6 115.4 . . ?
C5 C6 H6 115.4 . . ?
C6 C7 C8 131.3(3) . . ?
C6 C7 H7 114.4 . . ?
C8 C7 H7 114.4 . . ?
C9 C8 C7 125.6(3) . . ?
C9 C8 C20 119.5(2) . . ?
C7 C8 C20 114.9(2) . . ?
C8 C9 C10 129.9(3) . . ?
C8 C9 H9 115.0 . . ?
C10 C9 H9 115.0 . . ?
C9 C10 C1 124.6(2) . . ?
C9 C10 C4 128.4(2) . . ?
C1 C10 C4 107.0(2) . . ?
O1 C11 O2 122.2(2) . . ?
O1 C11 C1 126.2(3) . . ?
O2 C11 C1 111.7(2) . . ?
O2 C12 H12A 109.5 . . ?
O2 C12 H12B 109.5 . . ?
H12A C12 H12B 109.5 . . ?
O2 C12 H12C 109.5 . . ?
H12A C12 H12C 109.5 . . ?
H12B C12 H12C 109.5 . . ?
C14 C13 C2 126.9(3) . . ?
C14 C13 H13 116.5 . . ?
C2 C13 H13 116.5 . . ?
C13 C14 C15 119.5(2) . . ?
C13 C14 C17 132.6(3) . . ?
C15 C14 C17 107.5(2) . . ?
O3 C15 N1 124.7(3) . . ?
O3 C15 C14 128.7(2) . . ?
N1 C15 C14 106.6(2) . . ?
O4 C16 N1 124.3(3) . . ?
O4 C16 C17 127.1(3) . . ?
N1 C16 C17 108.6(2) . . ?
C14 C17 C16 103.7(2) . . ?
C14 C17 H17A 111.0 . . ?
C16 C17 H17A 111.0 . . ?
C14 C17 H17B 111.0 . . ?
C16 C17 H17B 111.0 . . ?
H17A C17 H17B 109.0 . . ?
N1 C18 H18A 109.5 . . ?
N1 C18 H18B 109.5 . . ?
H18A C18 H18B 109.5 . . ?
N1 C18 H18C 109.5 . . ?
H18A C18 H18C 109.5 . . ?
H18B C18 H18C 109.5 . . ?
O5 C19 C3 126.0(3) . . ?
O5 C19 H19 117.0 . . ?
C3 C19 H19 117.0 . . ?
C8 C20 C22 115.0(2) . . ?
C8 C20 C21 110.6(2) . . ?
C22 C20 C21 109.0(2) . . ?
C8 C20 H20 107.3 . . ?
C22 C20 H20 107.3 . . ?
C21 C20 H20 107.3 . . ?
C20 C21 H21A 109.5 . . ?
C20 C21 H21B 109.5 . . ?
H21A C21 H21B 109.5 . . ?
C20 C21 H21C 109.5 . . ?
H21A C21 H21C 109.5 . . ?
H21B C21 H21C 109.5 . . ?
C20 C22 H22A 109.5 . . ?
C20 C22 H22B 109.5 . . ?
H22A C22 H22B 109.5 . . ?
C20 C22 H22C 109.5 . . ?
H22A C22 H22C 109.5 . . ?
H22B C22 H22C 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
C10 C1 C2 C3 0.7(3) . . . . ?
C11 C1 C2 C3 -178.3(3) . . . . ?
C10 C1 C2 C13 177.6(2) . . . . ?
C11 C1 C2 C13 -1.4(4) . . . . ?
C1 C2 C3 C4 -0.7(3) . . . . ?
C13 C2 C3 C4 -177.7(3) . . . . ?
C1 C2 C3 C19 171.1(2) . . . . ?
C13 C2 C3 C19 -5.9(4) . . . . ?
C2 C3 C4 C5 178.6(3) . . . . ?
C19 C3 C4 C5 7.1(4) . . . . ?
C2 C3 C4 C10 0.5(3) . . . . ?
C19 C3 C4 C10 -171.0(2) . . . . ?
C3 C4 C5 C6 -179.9(3) . . . . ?
C10 C4 C5 C6 -2.1(5) . . . . ?
C4 C5 C6 C7 2.2(5) . . . . ?
C5 C6 C7 C8 1.3(6) . . . . ?
C6 C7 C8 C9 -3.8(5) . . . . ?
C6 C7 C8 C20 175.3(3) . . . . ?
C7 C8 C9 C10 2.1(5) . . . . ?
C20 C8 C9 C10 -176.9(3) . . . . ?
C8 C9 C10 C1 178.0(3) . . . . ?
C8 C9 C10 C4 0.6(5) . . . . ?
C2 C1 C10 C9 -178.3(2) . . . . ?
C11 C1 C10 C9 0.8(4) . . . . ?
C2 C1 C10 C4 -0.4(3) . . . . ?
C11 C1 C10 C4 178.7(2) . . . . ?
C5 C4 C10 C9 -0.3(5) . . . . ?
C3 C4 C10 C9 177.7(3) . . . . ?
C5 C4 C10 C1 -178.1(3) . . . . ?
C3 C4 C10 C1 0.0(3) . . . . ?
C12 O2 C11 O1 -3.0(4) . . . . ?
C12 O2 C11 C1 175.7(2) . . . . ?
C2 C1 C11 O1 175.1(3) . . . . ?
C10 C1 C11 O1 -3.8(4) . . . . ?
C2 C1 C11 O2 -3.5(4) . . . . ?
C10 C1 C11 O2 177.6(3) . . . . ?
C3 C2 C13 C14 -51.4(4) . . . . ?
C1 C2 C13 C14 132.2(3) . . . . ?
C2 C13 C14 C15 -176.3(2) . . . . ?
C2 C13 C14 C17 -3.7(5) . . . . ?
C16 N1 C15 O3 -179.3(3) . . . . ?
C18 N1 C15 O3 -4.0(4) . . . . ?
C16 N1 C15 C14 2.3(3) . . . . ?
C18 N1 C15 C14 177.6(2) . . . . ?
C13 C14 C15 O3 -8.1(4) . . . . ?
C17 C14 C15 O3 177.6(3) . . . . ?
C13 C14 C15 N1 170.2(2) . . . . ?
C17 C14 C15 N1 -4.1(3) . . . . ?
C15 N1 C16 O4 179.9(3) . . . . ?
C18 N1 C16 O4 4.6(5) . . . . ?
C15 N1 C16 C17 0.4(3) . . . . ?
C18 N1 C16 C17 -174.9(3) . . . . ?
C13 C14 C17 C16 -169.0(3) . . . . ?
C15 C14 C17 C16 4.2(3) . . . . ?
O4 C16 C17 C14 177.6(3) . . . . ?
N1 C16 C17 C14 -2.9(3) . . . . ?
C2 C3 C19 O5 175.3(3) . . . . ?
C4 C3 C19 O5 -14.4(5) . . . . ?
C9 C8 C20 C22 -10.7(4) . . . . ?
C7 C8 C20 C22 170.2(2) . . . . ?
C9 C8 C20 C21 113.3(3) . . . . ?
C7 C8 C20 C21 -65.8(3) . . . . ?

_refine_diff_density_max         0.197
_refine_diff_density_min         -0.218
_refine_diff_density_rms         0.047



