#------------------------------------------------------------------------------
#$Date: 2022-02-04 21:13:10 +0200 (Fri, 04 Feb 2022) $
#$Revision: 272582 $
#$URL: file:///home/coder/svn-repositories/cod/cif/1/56/58/1565838.cif $
#------------------------------------------------------------------------------
#
# This file is available in the Crystallography Open Database (COD),
# http://www.crystallography.net/
#
# All data on this site have been placed in the public domain by the
# contributors.
#
data_1565838
loop_
_publ_author_name
'Lang, Jiawen'
'Wang, Siyuan'
'He, Changli'
'Liu, Xiaohua'
'Feng, Xiaoming'
_publ_section_title
;
 Asymmetric synthesis of isochromanone derivatives via trapping carboxylic
 oxonium ylides and aldol cascade
;
_journal_issue                   4
_journal_name_full               'Chemical Science'
_journal_page_first              1163
_journal_page_last               1168
_journal_paper_doi               10.1039/D1SC06025B
_journal_volume                  13
_journal_year                    2022
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C25 H22 O4'
_chemical_formula_sum            'C25 H22 O4'
_chemical_formula_weight         386.42
_space_group_crystal_system      orthorhombic
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_atom_sites_solution_hydrogens   mixed
_atom_sites_solution_primary     dual
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-2018/3
_audit_update_record
;
2021-05-25 deposited with the CCDC.	2021-12-27 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   6.52630(10)
_cell_length_b                   13.9032(3)
_cell_length_c                   21.5712(4)
_cell_measurement_reflns_used    8338
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      68.26
_cell_measurement_theta_min      4.10
_cell_volume                     1957.29(6)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX3'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-2018/3 (Sheldrick, 2018)'
_computing_structure_solution    'SHELXT (Sheldrick 2008)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.971
_diffrn_measured_fraction_theta_max 0.971
_diffrn_measurement_device_type  'Bruker D8 Venture Photon II'
_diffrn_measurement_method       'φ and ω scans'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0341
_diffrn_reflns_av_unetI/netI     0.0328
_diffrn_reflns_Laue_measured_fraction_full 0.971
_diffrn_reflns_Laue_measured_fraction_max 0.971
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            10060
_diffrn_reflns_point_group_measured_fraction_full 0.967
_diffrn_reflns_point_group_measured_fraction_max 0.967
_diffrn_reflns_theta_full        67.679
_diffrn_reflns_theta_max         68.254
_diffrn_reflns_theta_min         4.099
_exptl_absorpt_coefficient_mu    0.711
_exptl_absorpt_correction_T_max  0.9397
_exptl_absorpt_correction_T_min  0.7942
_exptl_absorpt_correction_type   numerical
_exptl_absorpt_process_details   'SADABS (Krause et al., 2015)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.311
_exptl_crystal_description       block
_exptl_crystal_F_000             816
_exptl_crystal_recrystallization_method
'Re-crystallisation from solvent: DCM, iPrOH, PE'
_exptl_crystal_size_max          0.326
_exptl_crystal_size_mid          0.250
_exptl_crystal_size_min          0.170
_refine_diff_density_max         0.172
_refine_diff_density_min         -0.210
_refine_diff_density_rms         0.044
_refine_ls_abs_structure_details
; 
 Flack x determined using 1356 quotients [(I+)-(I-)]/[(I+)+(I-)] 
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259). 
;
_refine_ls_abs_structure_Flack   0.04(6)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.127
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     271
_refine_ls_number_reflns         3454
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      1.127
_refine_ls_R_factor_all          0.0303
_refine_ls_R_factor_gt           0.0282
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[σ²(Fo²)+(0.0380P)²+0.1697P] where P=(Fo²+2Fc²)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0732
_refine_ls_wR_factor_ref         0.0752
_reflns_Friedel_coverage         0.716
_reflns_Friedel_fraction_full    0.962
_reflns_Friedel_fraction_max     0.962
_reflns_number_gt                3307
_reflns_number_total             3454
_reflns_threshold_expression     'I > 2σ(I)'
_cod_data_source_file            d1sc06025b2.cif
_cod_data_source_block           ljw005
_cod_depositor_comments
'Adding full bibliography for 1565837--1565838.cif.'
_cod_database_code               1565838
_shelx_shelxl_version_number     2018/3
_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. 
;
_shelx_estimated_absorpt_t_min   0.801
_shelx_estimated_absorpt_t_max   0.889
loop_
_space_group_symop_operation_xyz
'x, y, z'
'-x+1/2, -y, z+1/2'
'-x, y+1/2, -z+1/2'
'x+1/2, -y+1/2, -z'
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 0.9614(2) 0.14557(10) 0.70327(6) 0.0265(3) Uani 1 1 d D . . . .
H1O H 1.037(5) 0.146(2) 0.7349(12) 0.062(10) Uiso 1 1 d D . . . .
O2 O 0.8734(2) 0.32695(9) 0.67182(6) 0.0247(3) Uani 1 1 d D . . . .
H2O H 0.943(4) 0.2770(17) 0.6811(13) 0.043(7) Uiso 1 1 d D . . . .
O3 O 0.41067(18) 0.19026(9) 0.71832(5) 0.0205(3) Uani 1 1 d . . . . .
O4 O 0.2197(2) 0.19434(11) 0.80156(6) 0.0318(3) Uani 1 1 d . . . . .
C1 C 0.6912(3) 0.02663(13) 0.70871(9) 0.0287(4) Uani 1 1 d . . . . .
H1A H 0.769792 -0.016847 0.735413 0.043 Uiso 1 1 calc R U . . .
H1B H 0.718943 0.011380 0.665155 0.043 Uiso 1 1 calc R U . . .
H1C H 0.544569 0.018716 0.717100 0.043 Uiso 1 1 calc R U . . .
C2 C 0.7534(3) 0.12962(12) 0.72178(8) 0.0205(3) Uani 1 1 d . . . . .
H2 H 0.742922 0.141010 0.767440 0.025 Uiso 1 1 calc R U . . .
C3 C 0.6099(3) 0.20261(12) 0.68809(7) 0.0185(3) Uani 1 1 d . . . . .
C4 C 0.6765(3) 0.31003(13) 0.69696(8) 0.0204(4) Uani 1 1 d . . . . .
C5 C 0.5262(3) 0.37672(12) 0.66532(8) 0.0219(4) Uani 1 1 d . . . . .
H5 H 0.384448 0.368527 0.673781 0.026 Uiso 1 1 calc R U . . .
C6 C 0.5811(3) 0.44608(13) 0.62640(8) 0.0267(4) Uani 1 1 d . . . . .
H6 H 0.723146 0.451801 0.617480 0.032 Uiso 1 1 calc R U . . .
C7 C 0.3750(3) 0.22199(12) 0.77653(8) 0.0213(4) Uani 1 1 d . . . . .
C11 C 0.5733(3) 0.17762(12) 0.62014(8) 0.0201(3) Uani 1 1 d . . . . .
C12 C 0.7386(3) 0.16927(15) 0.57939(8) 0.0294(4) Uani 1 1 d . . . . .
H12 H 0.874036 0.179674 0.594035 0.035 Uiso 1 1 calc R U . . .
C13 C 0.7061(4) 0.14582(16) 0.51747(9) 0.0337(5) Uani 1 1 d . . . . .
H13 H 0.819683 0.140321 0.490151 0.040 Uiso 1 1 calc R U . . .
C14 C 0.5109(4) 0.13051(15) 0.49543(9) 0.0331(5) Uani 1 1 d . . . . .
H14 H 0.489132 0.114962 0.453059 0.040 Uiso 1 1 calc R U . . .
C15 C 0.3478(3) 0.13799(16) 0.53552(9) 0.0346(5) Uani 1 1 d . . . . .
H15 H 0.212812 0.127331 0.520565 0.042 Uiso 1 1 calc R U . . .
C16 C 0.3776(3) 0.16092(14) 0.59761(9) 0.0274(4) Uani 1 1 d . . . . .
H16 H 0.263274 0.165172 0.624728 0.033 Uiso 1 1 calc R U . . .
C21 C 0.6713(3) 0.33237(12) 0.76644(7) 0.0206(4) Uani 1 1 d . . . . .
C22 C 0.5228(3) 0.29014(12) 0.80391(8) 0.0221(4) Uani 1 1 d . . . . .
C23 C 0.5077(3) 0.31321(14) 0.86662(8) 0.0286(4) Uani 1 1 d . . . . .
H23 H 0.405619 0.284005 0.891735 0.034 Uiso 1 1 calc R U . . .
C24 C 0.6428(4) 0.37904(15) 0.89195(9) 0.0346(5) Uani 1 1 d . . . . .
H24 H 0.633751 0.395197 0.934655 0.042 Uiso 1 1 calc R U . . .
C25 C 0.7915(4) 0.42141(15) 0.85508(10) 0.0337(5) Uani 1 1 d . . . . .
H25 H 0.883974 0.466621 0.872599 0.040 Uiso 1 1 calc R U . . .
C26 C 0.8057(3) 0.39803(14) 0.79253(9) 0.0278(4) Uani 1 1 d . . . . .
H26 H 0.908240 0.427247 0.767565 0.033 Uiso 1 1 calc R U . . .
C31 C 0.4428(3) 0.51506(12) 0.59571(8) 0.0269(4) Uani 1 1 d . . . . .
C32 C 0.2464(3) 0.53551(14) 0.61702(9) 0.0305(4) Uani 1 1 d . . . . .
H32 H 0.196873 0.504327 0.653236 0.037 Uiso 1 1 calc R U . . .
C33 C 0.1215(4) 0.60076(15) 0.58622(10) 0.0376(5) Uani 1 1 d . . . . .
H33 H -0.011196 0.615067 0.601825 0.045 Uiso 1 1 calc R U . . .
C34 C 0.1914(4) 0.64503(15) 0.53249(10) 0.0402(5) Uani 1 1 d . . . . .
H34 H 0.105771 0.689118 0.511025 0.048 Uiso 1 1 calc R U . . .
C35 C 0.3851(4) 0.62506(15) 0.51024(10) 0.0397(5) Uani 1 1 d . . . . .
H35 H 0.431758 0.654612 0.473126 0.048 Uiso 1 1 calc R U . . .
C36 C 0.5117(4) 0.56178(13) 0.54206(9) 0.0344(5) Uani 1 1 d . . . . .
H36 H 0.646551 0.550045 0.527308 0.041 Uiso 1 1 calc R U . . .
loop_
_atom_type_symbol
_atom_type_description
_atom_type_scat_dispersion_real
_atom_type_scat_dispersion_imag
_atom_type_scat_source
C C 0.0181 0.0091 '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 0.0492 0.0322 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
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
C2 O1 H1O 109(2) . . ?
C4 O2 H2O 105(2) . . ?
C7 O3 C3 121.90(13) . . ?
C2 C1 H1A 109.5 . . ?
C2 C1 H1B 109.5 . . ?
H1A C1 H1B 109.5 . . ?
C2 C1 H1C 109.5 . . ?
H1A C1 H1C 109.5 . . ?
H1B C1 H1C 109.5 . . ?
O1 C2 C1 110.39(15) . . ?
O1 C2 C3 109.77(13) . . ?
C1 C2 C3 111.55(14) . . ?
O1 C2 H2 108.3 . . ?
C1 C2 H2 108.3 . . ?
C3 C2 H2 108.3 . . ?
O3 C3 C11 105.19(13) . . ?
O3 C3 C2 104.43(12) . . ?
C11 C3 C2 113.16(13) . . ?
O3 C3 C4 107.67(13) . . ?
C11 C3 C4 112.20(13) . . ?
C2 C3 C4 113.37(14) . . ?
O2 C4 C5 108.31(14) . . ?
O2 C4 C21 111.19(15) . . ?
C5 C4 C21 107.65(14) . . ?
O2 C4 C3 111.32(14) . . ?
C5 C4 C3 110.46(14) . . ?
C21 C4 C3 107.86(13) . . ?
C6 C5 C4 123.76(18) . . ?
C6 C5 H5 118.1 . . ?
C4 C5 H5 118.1 . . ?
C5 C6 C31 126.2(2) . . ?
C5 C6 H6 116.9 . . ?
C31 C6 H6 116.9 . . ?
O4 C7 O3 117.07(16) . . ?
O4 C7 C22 124.93(16) . . ?
O3 C7 C22 117.97(15) . . ?
C16 C11 C12 118.49(16) . . ?
C16 C11 C3 121.30(16) . . ?
C12 C11 C3 120.20(16) . . ?
C13 C12 C11 120.42(19) . . ?
C13 C12 H12 119.8 . . ?
C11 C12 H12 119.8 . . ?
C14 C13 C12 120.59(19) . . ?
C14 C13 H13 119.7 . . ?
C12 C13 H13 119.7 . . ?
C15 C14 C13 119.18(17) . . ?
C15 C14 H14 120.4 . . ?
C13 C14 H14 120.4 . . ?
C14 C15 C16 120.98(19) . . ?
C14 C15 H15 119.5 . . ?
C16 C15 H15 119.5 . . ?
C11 C16 C15 120.33(19) . . ?
C11 C16 H16 119.8 . . ?
C15 C16 H16 119.8 . . ?
C26 C21 C22 118.88(16) . . ?
C26 C21 C4 121.16(16) . . ?
C22 C21 C4 119.87(15) . . ?
C21 C22 C23 121.03(17) . . ?
C21 C22 C7 119.59(15) . . ?
C23 C22 C7 119.36(17) . . ?
C24 C23 C22 119.40(19) . . ?
C24 C23 H23 120.3 . . ?
C22 C23 H23 120.3 . . ?
C23 C24 C25 120.04(18) . . ?
C23 C24 H24 120.0 . . ?
C25 C24 H24 120.0 . . ?
C24 C25 C26 120.29(18) . . ?
C24 C25 H25 119.9 . . ?
C26 C25 H25 119.9 . . ?
C21 C26 C25 120.37(19) . . ?
C21 C26 H26 119.8 . . ?
C25 C26 H26 119.8 . . ?
C32 C31 C36 118.30(19) . . ?
C32 C31 C6 123.29(17) . . ?
C36 C31 C6 118.4(2) . . ?
C33 C32 C31 121.08(19) . . ?
C33 C32 H32 119.5 . . ?
C31 C32 H32 119.5 . . ?
C32 C33 C34 119.7(2) . . ?
C32 C33 H33 120.1 . . ?
C34 C33 H33 120.1 . . ?
C35 C34 C33 120.1(2) . . ?
C35 C34 H34 119.9 . . ?
C33 C34 H34 119.9 . . ?
C34 C35 C36 120.0(2) . . ?
C34 C35 H35 120.0 . . ?
C36 C35 H35 120.0 . . ?
C35 C36 C31 120.7(2) . . ?
C35 C36 H36 119.6 . . ?
C31 C36 H36 119.6 . . ?
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 C2 1.432(2) . ?
O1 H1O 0.84(2) . ?
O2 C4 1.415(2) . ?
O2 H2O 0.85(2) . ?
O3 C7 1.351(2) . ?
O3 C3 1.465(2) . ?
O4 C7 1.211(2) . ?
C1 C2 1.515(2) . ?
C1 H1A 0.9800 . ?
C1 H1B 0.9800 . ?
C1 H1C 0.9800 . ?
C2 C3 1.560(2) . ?
C2 H2 1.0000 . ?
C3 C11 1.525(2) . ?
C3 C4 1.567(2) . ?
C4 C5 1.512(2) . ?
C4 C21 1.531(2) . ?
C5 C6 1.328(3) . ?
C5 H5 0.9500 . ?
C6 C31 1.474(3) . ?
C6 H6 0.9500 . ?
C7 C22 1.475(3) . ?
C11 C16 1.386(3) . ?
C11 C12 1.396(3) . ?
C12 C13 1.391(3) . ?
C12 H12 0.9500 . ?
C13 C14 1.376(3) . ?
C13 H13 0.9500 . ?
C14 C15 1.375(3) . ?
C14 H14 0.9500 . ?
C15 C16 1.390(3) . ?
C15 H15 0.9500 . ?
C16 H16 0.9500 . ?
C21 C26 1.386(3) . ?
C21 C22 1.392(3) . ?
C22 C23 1.394(2) . ?
C23 C24 1.383(3) . ?
C23 H23 0.9500 . ?
C24 C25 1.386(3) . ?
C24 H24 0.9500 . ?
C25 C26 1.391(3) . ?
C25 H25 0.9500 . ?
C26 H26 0.9500 . ?
C31 C32 1.391(3) . ?
C31 C36 1.401(3) . ?
C32 C33 1.389(3) . ?
C32 H32 0.9500 . ?
C33 C34 1.389(3) . ?
C33 H33 0.9500 . ?
C34 C35 1.380(4) . ?
C34 H34 0.9500 . ?
C35 C36 1.389(3) . ?
C35 H35 0.9500 . ?
C36 H36 0.9500 . ?
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
C7 O3 C3 C11 -168.22(13) . . . . ?
C7 O3 C3 C2 72.39(18) . . . . ?
C7 O3 C3 C4 -48.39(19) . . . . ?
O1 C2 C3 O3 -170.69(12) . . . . ?
C1 C2 C3 O3 66.62(17) . . . . ?
O1 C2 C3 C11 75.46(18) . . . . ?
C1 C2 C3 C11 -47.2(2) . . . . ?
O1 C2 C3 C4 -53.78(18) . . . . ?
C1 C2 C3 C4 -176.47(15) . . . . ?
O3 C3 C4 O2 176.90(12) . . . . ?
C11 C3 C4 O2 -67.82(18) . . . . ?
C2 C3 C4 O2 61.91(18) . . . . ?
O3 C3 C4 C5 -62.74(17) . . . . ?
C11 C3 C4 C5 52.54(19) . . . . ?
C2 C3 C4 C5 -177.73(13) . . . . ?
O3 C3 C4 C21 54.66(17) . . . . ?
C11 C3 C4 C21 169.94(15) . . . . ?
C2 C3 C4 C21 -60.33(18) . . . . ?
O2 C4 C5 C6 -7.4(2) . . . . ?
C21 C4 C5 C6 112.97(19) . . . . ?
C3 C4 C5 C6 -129.50(17) . . . . ?
C4 C5 C6 C31 -178.00(16) . . . . ?
C3 O3 C7 O4 -167.55(16) . . . . ?
C3 O3 C7 C22 14.7(2) . . . . ?
O3 C3 C11 C16 7.5(2) . . . . ?
C2 C3 C11 C16 120.86(18) . . . . ?
C4 C3 C11 C16 -109.30(18) . . . . ?
O3 C3 C11 C12 -171.29(15) . . . . ?
C2 C3 C11 C12 -57.9(2) . . . . ?
C4 C3 C11 C12 71.9(2) . . . . ?
C16 C11 C12 C13 0.7(3) . . . . ?
C3 C11 C12 C13 179.54(18) . . . . ?
C11 C12 C13 C14 0.0(3) . . . . ?
C12 C13 C14 C15 -0.5(3) . . . . ?
C13 C14 C15 C16 0.2(3) . . . . ?
C12 C11 C16 C15 -1.0(3) . . . . ?
C3 C11 C16 C15 -179.83(17) . . . . ?
C14 C15 C16 C11 0.6(3) . . . . ?
O2 C4 C21 C26 26.2(2) . . . . ?
C5 C4 C21 C26 -92.3(2) . . . . ?
C3 C4 C21 C26 148.48(17) . . . . ?
O2 C4 C21 C22 -157.21(16) . . . . ?
C5 C4 C21 C22 84.30(19) . . . . ?
C3 C4 C21 C22 -34.9(2) . . . . ?
C26 C21 C22 C23 0.2(3) . . . . ?
C4 C21 C22 C23 -176.51(17) . . . . ?
C26 C21 C22 C7 178.42(16) . . . . ?
C4 C21 C22 C7 1.7(2) . . . . ?
O4 C7 C22 C21 -166.38(18) . . . . ?
O3 C7 C22 C21 11.2(2) . . . . ?
O4 C7 C22 C23 11.9(3) . . . . ?
O3 C7 C22 C23 -170.58(16) . . . . ?
C21 C22 C23 C24 -0.1(3) . . . . ?
C7 C22 C23 C24 -178.31(18) . . . . ?
C22 C23 C24 C25 0.0(3) . . . . ?
C23 C24 C25 C26 0.0(3) . . . . ?
C22 C21 C26 C25 -0.2(3) . . . . ?
C4 C21 C26 C25 176.43(18) . . . . ?
C24 C25 C26 C21 0.2(3) . . . . ?
C5 C6 C31 C32 20.0(3) . . . . ?
C5 C6 C31 C36 -159.43(18) . . . . ?
C36 C31 C32 C33 -0.2(3) . . . . ?
C6 C31 C32 C33 -179.65(18) . . . . ?
C31 C32 C33 C34 1.4(3) . . . . ?
C32 C33 C34 C35 -0.8(3) . . . . ?
C33 C34 C35 C36 -1.0(3) . . . . ?
C34 C35 C36 C31 2.2(3) . . . . ?
C32 C31 C36 C35 -1.5(3) . . . . ?
C6 C31 C36 C35 177.90(18) . . . . ?
