# Electronic Supplementary Material (ESI) for Organic & Biomolecular Chemistry.
# This journal is © The Royal Society of Chemistry 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_a_a
_database_code_depnum_ccdc_archive 'CCDC 1841007'
_audit_update_record             
;
2018-05-02 deposited with the CCDC.
2018-10-16 downloaded from the CCDC.
;

_audit_creation_method           SHELXL-2014/7
_shelx_SHELXL_version_number     2014/7
_chemical_name_systematic        ?
_chemical_name_common            ?
_chemical_melting_point          ?
_chemical_formula_moiety         'C20 H18 O3'
_chemical_formula_sum            'C20 H18 O3'
_chemical_formula_weight         306.34

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'

_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_H-M_alt        'P 21/c'
_space_group_name_Hall           '-P 2ybc'

_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+1/2, -z+1/2'
'-x, -y, -z'
'x, -y-1/2, z-1/2'

_cell_length_a                   13.4246(12)
_cell_length_b                   7.1750(7)
_cell_length_c                   17.1559(14)
_cell_angle_alpha                90
_cell_angle_beta                 97.007(3)
_cell_angle_gamma                90
_cell_volume                     1640.1(3)
_cell_formula_units_Z            4
_cell_measurement_temperature    296(2)
_cell_measurement_reflns_used    2207
_cell_measurement_theta_min      2.68
_cell_measurement_theta_max      26.93

_exptl_crystal_description       block
_exptl_crystal_colour            colorless
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    ?
_exptl_crystal_density_diffrn    1.241
_exptl_crystal_F_000             648
_exptl_transmission_factor_min   ?
_exptl_transmission_factor_max   ?
_exptl_crystal_size_max          ?
_exptl_crystal_size_mid          ?
_exptl_crystal_size_min          ?
_exptl_absorpt_coefficient_mu    0.083
_shelx_estimated_absorpt_T_min   ?
_shelx_estimated_absorpt_T_max   ?
_exptl_absorpt_correction_type   none
_exptl_absorpt_correction_T_min  ?
_exptl_absorpt_correction_T_max  ?
_exptl_absorpt_process_details   ?
_exptl_absorpt_special_details   ?
_diffrn_ambient_temperature      296(2)
_diffrn_radiation_wavelength     0.71073
_diffrn_radiation_type           MoK\a
_diffrn_source                   ?
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       'φ and ω scans'
_diffrn_detector_area_resol_mean ?
_diffrn_reflns_number            8786
_diffrn_reflns_av_unetI/netI     0.0737
_diffrn_reflns_av_R_equivalents  0.0473
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_theta_min         2.392
_diffrn_reflns_theta_max         27.585
_diffrn_reflns_theta_full        25.242
_diffrn_measured_fraction_theta_max 0.989
_diffrn_measured_fraction_theta_full 0.998
_diffrn_reflns_Laue_measured_fraction_max 0.989
_diffrn_reflns_Laue_measured_fraction_full 0.998
_diffrn_reflns_point_group_measured_fraction_max 0.989
_diffrn_reflns_point_group_measured_fraction_full 0.998
_reflns_number_total             3771
_reflns_number_gt                2349
_reflns_threshold_expression     'I > 2σ(I)'
_reflns_Friedel_coverage         0.000
_reflns_Friedel_fraction_max     .
_reflns_Friedel_fraction_full    .

_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       'Bruker APEX2'
_computing_cell_refinement       'Bruker SAINT'
_computing_data_reduction        'Bruker SAINT'
_computing_structure_solution    'SHELXS-97 (Sheldrick 2008)'
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_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)+(0.1000P)²+0.2936P] where P=(Fo²+2Fc²)/3'
_atom_sites_solution_primary     ?
_atom_sites_solution_secondary   ?
_atom_sites_solution_hydrogens   geom
_refine_ls_hydrogen_treatment    constr
_refine_ls_extinction_method     none
_refine_ls_extinction_coef       .
_refine_ls_number_reflns         3771
_refine_ls_number_parameters     210
_refine_ls_number_restraints     0
_refine_ls_R_factor_all          0.1144
_refine_ls_R_factor_gt           0.0594
_refine_ls_wR_factor_ref         0.1762
_refine_ls_wR_factor_gt          0.1469
_refine_ls_goodness_of_fit_ref   0.944
_refine_ls_restrained_S_all      0.944
_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 0.06928(10) 0.2315(2) 0.52231(8) 0.0284(4) Uani 1 1 d . . . . .
O3 O 0.29338(11) 0.5727(2) 0.42276(9) 0.0357(4) Uani 1 1 d . . . . .
O2 O 0.06120(11) 0.4153(2) 0.41871(9) 0.0389(4) Uani 1 1 d . . . . .
C14 C 0.23380(13) 0.4344(3) 0.59385(12) 0.0224(5) Uani 1 1 d . . . . .
C7 C 0.19022(14) 0.2867(3) 0.63631(12) 0.0227(5) Uani 1 1 d . . . . .
C8 C 0.10222(14) -0.0150(3) 0.70784(13) 0.0253(5) Uani 1 1 d . . . . .
C1 C 0.32189(14) 0.5416(3) 0.63235(12) 0.0229(5) Uani 1 1 d . . . . .
C16 C 0.10571(15) 0.3770(3) 0.48179(12) 0.0269(5) Uani 1 1 d . . . . .
C9 C 0.10988(14) 0.1862(3) 0.59756(11) 0.0224(5) Uani 1 1 d . . . . .
C15 C 0.19441(14) 0.4726(3) 0.51917(12) 0.0236(5) Uani 1 1 d . . . . .
C10 C 0.06744(14) 0.0369(3) 0.63172(12) 0.0254(5) Uani 1 1 d . . . . .
H10 H 0.0153 -0.0291 0.6036 0.031 Uiso 1 1 calc R U . . .
C17 C 0.23664(14) 0.6180(3) 0.46892(12) 0.0262(5) Uani 1 1 d . . . . .
C11 C 0.18198(14) 0.0858(3) 0.74794(12) 0.0290(5) Uani 1 1 d . . . . .
H11 H 0.2059 0.0533 0.7993 0.035 Uiso 1 1 calc R U . . .
C2 C 0.41512(14) 0.5291(3) 0.60575(13) 0.0274(5) Uani 1 1 d . . . . .
H2 H 0.4239 0.4519 0.5636 0.033 Uiso 1 1 calc R U . . .
C12 C 0.22540(14) 0.2312(3) 0.71290(12) 0.0267(5) Uani 1 1 d . . . . .
H12 H 0.2791 0.2941 0.7405 0.032 Uiso 1 1 calc R U . . .
C3 C 0.49523(15) 0.6319(3) 0.64203(14) 0.0344(6) Uani 1 1 d . . . . .
H3 H 0.5578 0.6230 0.6243 0.041 Uiso 1 1 calc R U . . .
C4 C 0.31027(15) 0.6554(3) 0.69572(14) 0.0347(6) Uani 1 1 d . . . . .
H4 H 0.2483 0.6621 0.7146 0.042 Uiso 1 1 calc R U . . .
C13 C 0.05442(17) -0.1735(3) 0.74693(13) 0.0326(5) Uani 1 1 d . . . . .
H13A H -0.0021 -0.1280 0.7705 0.049 Uiso 1 1 calc R U . . .
H13B H 0.1025 -0.2270 0.7867 0.049 Uiso 1 1 calc R U . . .
H13C H 0.0324 -0.2668 0.7085 0.049 Uiso 1 1 calc R U . . .
C5 C 0.48249(16) 0.7469(4) 0.70423(16) 0.0400(6) Uani 1 1 d . . . . .
H5 H 0.5362 0.8165 0.7281 0.048 Uiso 1 1 calc R U . . .
C6 C 0.38988(17) 0.7592(4) 0.73130(16) 0.0429(7) Uani 1 1 d . . . . .
H6 H 0.3812 0.8371 0.7733 0.051 Uiso 1 1 calc R U . . .
C18 C 0.20202(19) 0.8136(3) 0.47779(16) 0.0420(6) Uani 1 1 d . . . . .
H18A H 0.2095 0.8446 0.5332 0.050 Uiso 1 1 calc R U . . .
H18B H 0.1311 0.8207 0.4585 0.050 Uiso 1 1 calc R U . . .
C19 C 0.2576(2) 0.9582(4) 0.43507(19) 0.0546(8) Uani 1 1 d . . . . .
H19A H 0.2630 0.9146 0.3822 0.066 Uiso 1 1 calc R U . . .
H19B H 0.2194 1.0732 0.4311 0.066 Uiso 1 1 calc R U . . .
C20 C 0.3606(3) 0.9963(5) 0.4760(3) 0.0958(14) Uani 1 1 d . . . . .
H20A H 0.3558 1.0353 0.5289 0.144 Uiso 1 1 calc R U . . .
H20B H 0.3915 1.0931 0.4487 0.144 Uiso 1 1 calc R U . . .
H20C H 0.4004 0.8851 0.4766 0.144 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 C16 1.377(3) . ?
O1 C9 1.378(2) . ?
O3 C17 1.208(2) . ?
O2 C16 1.203(2) . ?
C14 C15 1.353(3) . ?
C14 C7 1.449(3) . ?
C14 C1 1.495(3) . ?
C7 C9 1.397(3) . ?
C7 C12 1.399(3) . ?
C8 C10 1.383(3) . ?
C8 C11 1.401(3) . ?
C8 C13 1.503(3) . ?
C1 C4 1.384(3) . ?
C1 C2 1.386(3) . ?
C16 C15 1.454(3) . ?
C9 C10 1.377(3) . ?
C15 C17 1.507(3) . ?
C10 H10 0.9300 . ?
C17 C18 1.492(3) . ?
C11 C12 1.370(3) . ?
C11 H11 0.9300 . ?
C2 C3 1.387(3) . ?
C2 H2 0.9300 . ?
C12 H12 0.9300 . ?
C3 C5 1.376(4) . ?
C3 H3 0.9300 . ?
C4 C6 1.382(3) . ?
C4 H4 0.9300 . ?
C13 H13A 0.9600 . ?
C13 H13B 0.9600 . ?
C13 H13C 0.9600 . ?
C5 C6 1.382(3) . ?
C5 H5 0.9300 . ?
C6 H6 0.9300 . ?
C18 C19 1.518(3) . ?
C18 H18A 0.9700 . ?
C18 H18B 0.9700 . ?
C19 C20 1.497(4) . ?
C19 H19A 0.9700 . ?
C19 H19B 0.9700 . ?
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
C16 O1 C9 121.86(15) . . ?
C15 C14 C7 119.29(17) . . ?
C15 C14 C1 120.70(19) . . ?
C7 C14 C1 120.01(17) . . ?
C9 C7 C12 116.9(2) . . ?
C9 C7 C14 118.30(18) . . ?
C12 C7 C14 124.73(18) . . ?
C10 C8 C11 118.3(2) . . ?
C10 C8 C13 120.77(19) . . ?
C11 C8 C13 120.91(19) . . ?
C4 C1 C2 119.30(19) . . ?
C4 C1 C14 119.46(18) . . ?
C2 C1 C14 121.24(19) . . ?
O2 C16 O1 117.37(18) . . ?
O2 C16 C15 125.4(2) . . ?
O1 C16 C15 117.22(17) . . ?
C10 C9 O1 116.44(17) . . ?
C10 C9 C7 122.33(19) . . ?
O1 C9 C7 121.23(19) . . ?
C14 C15 C16 121.77(19) . . ?
C14 C15 C17 123.44(17) . . ?
C16 C15 C17 114.78(17) . . ?
C9 C10 C8 120.10(19) . . ?
C9 C10 H10 119.9 . . ?
C8 C10 H10 119.9 . . ?
O3 C17 C18 123.3(2) . . ?
O3 C17 C15 120.0(2) . . ?
C18 C17 C15 116.69(19) . . ?
C12 C11 C8 121.23(19) . . ?
C12 C11 H11 119.4 . . ?
C8 C11 H11 119.4 . . ?
C1 C2 C3 120.0(2) . . ?
C1 C2 H2 120.0 . . ?
C3 C2 H2 120.0 . . ?
C11 C12 C7 121.08(19) . . ?
C11 C12 H12 119.5 . . ?
C7 C12 H12 119.5 . . ?
C5 C3 C2 120.3(2) . . ?
C5 C3 H3 119.9 . . ?
C2 C3 H3 119.9 . . ?
C6 C4 C1 120.7(2) . . ?
C6 C4 H4 119.7 . . ?
C1 C4 H4 119.7 . . ?
C8 C13 H13A 109.5 . . ?
C8 C13 H13B 109.5 . . ?
H13A C13 H13B 109.5 . . ?
C8 C13 H13C 109.5 . . ?
H13A C13 H13C 109.5 . . ?
H13B C13 H13C 109.5 . . ?
C3 C5 C6 120.1(2) . . ?
C3 C5 H5 120.0 . . ?
C6 C5 H5 120.0 . . ?
C5 C6 C4 119.7(2) . . ?
C5 C6 H6 120.1 . . ?
C4 C6 H6 120.1 . . ?
C17 C18 C19 114.6(2) . . ?
C17 C18 H18A 108.6 . . ?
C19 C18 H18A 108.6 . . ?
C17 C18 H18B 108.6 . . ?
C19 C18 H18B 108.6 . . ?
H18A C18 H18B 107.6 . . ?
C20 C19 C18 112.3(3) . . ?
C20 C19 H19A 109.1 . . ?
C18 C19 H19A 109.1 . . ?
C20 C19 H19B 109.1 . . ?
C18 C19 H19B 109.1 . . ?
H19A C19 H19B 107.9 . . ?
C19 C20 H20A 109.5 . . ?
C19 C20 H20B 109.5 . . ?
H20A C20 H20B 109.5 . . ?
C19 C20 H20C 109.5 . . ?
H20A C20 H20C 109.5 . . ?
H20B C20 H20C 109.5 . . ?

_refine_diff_density_max         0.235
_refine_diff_density_min         -0.262
_refine_diff_density_rms         0.050

