# Electronic Supplementary Material (ESI) for ChemComm.
# This journal is © The Royal Society of Chemistry 2023

####################################################################### 
# 
# 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_AC157A
_database_code_depnum_ccdc_archive 'CCDC 2192825'
loop_
_audit_author_name
_audit_author_address
'Leslaw Sieron'
;Lodz University of Technology
Poland
;
_audit_update_record             
;
2022-07-26 deposited with the CCDC.	2023-04-24 downloaded from the CCDC.
;

#===============================================================================

# CHEMICAL DATA

_chemical_name_systematic        
;
tert-butyl 2-((R)-((R)-2-formyl-3-phenyl-1H-inden-1-yl)(phenyl)methyl)acrylate
;
_chemical_melting_point          ?
_chemical_formula_moiety         'C30 H28 O3'
_chemical_formula_structural     ?
_chemical_formula_sum            'C30 H28 O3'
_chemical_formula_iupac          ?
_chemical_formula_weight         436.52

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'

#===============================================================================

# CRYSTAL DATA

_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  'P 1'
_symmetry_space_group_name_H-M   'P 1'
_symmetry_Int_Tables_number      1

loop_
_space_group_symop_id
_space_group_symop_operation_xyz
1 x,y,z

_cell_length_a                   8.0220(1)
_cell_length_b                   8.2914(1)
_cell_length_c                   10.1712(1)
_cell_angle_alpha                76.898(1)
_cell_angle_beta                 85.404(1)
_cell_angle_gamma                62.195(1)
_cell_volume                     582.577(13)
_cell_formula_units_Z            1
_cell_measurement_temperature    100
_cell_measurement_reflns_used    19104
_cell_measurement_theta_min      4.457
_cell_measurement_theta_max      78.473
_exptl_crystal_description       plate
_exptl_crystal_colour            colourless
_exptl_crystal_size_max          0.29
_exptl_crystal_size_mid          0.19
_exptl_crystal_size_min          0.05
_exptl_crystal_density_diffrn    1.244
_exptl_crystal_F_000             232
_exptl_absorpt_coefficient_mu    0.623
_exptl_absorpt_correction_T_min  0.529
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_type   gaussian
_exptl_absorpt_process_details   
;
CrysAlisPro 1.171.42.58a (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.
Empirical correction (ABSPACK) includes:
- Absorption correction using spherical harmonics
- Frame scaling
- Detector area scaling
;

#===============================================================================

# EXPERIMENTAL DATA

_diffrn_ambient_temperature      100
_diffrn_ambient_environment      N~2~
_diffrn_source                   'micro-focus sealed X-ray tube'
_diffrn_source_type              'PhotonJet (Cu) X-ray Source'
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           'Cu K\a'
_diffrn_radiation_wavelength     1.54184
_diffrn_radiation_monochromator  mirror
_diffrn_measurement_method       'ω scans'
_diffrn_measurement_device       'four-circle diffractometer'
_diffrn_measurement_device_type  'XtaLAB Synergy, Dualflex, Pilatus 300K'
_diffrn_detector                 'Hybrid Pixel Array Detector'
_diffrn_detector_type            'Pilatus 300K'
_diffrn_detector_area_resol_mean 5.8140

# number of measured reflections (redundant set)
_diffrn_reflns_number            20203
_diffrn_reflns_av_R_equivalents  0.0144
_diffrn_reflns_av_unetI/netI     0.0099
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_theta_min         4.47
_diffrn_reflns_theta_max         66.58
_diffrn_reflns_theta_full        66.58
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measured_fraction_theta_full 1.000

# number of unique reflections
_reflns_number_total             3917
# number of observed reflections (> n sig(I))
_reflns_number_gt                3905
_reflns_threshold_expression     I>2σ(I)

_computing_data_collection       'CrysAlisPro 1.171.42.58a (Rigaku OD, 2022)'
_computing_cell_refinement       'CrysAlisPro 1.171.42.58a (Rigaku OD, 2022)'
_computing_data_reduction        'CrysAlisPro 1.171.42.58a (Rigaku OD, 2022)'
_computing_structure_refinement  'SHELXL-2018/3 (Sheldrick, 2018)'

#===============================================================================

# REFINEMENT DATA

_refine_special_details          
;
 Refinement on F² for ALL reflections except those
 flagged by the user for potential systematic errors.
 Weighted R-factors wR and all goodnesses of fit S
 are based on F², conventional R-factors R are based
 on F, with F set to zero for negative F². The
 observed criterion of F² > 2sigma(F²) is used only
 for calculating -R-factor-obs 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.
;
_refine_ls_structure_factor_coef Fsqd
_refine_ls_matrix_type           full
_refine_ls_weighting_scheme      calc
_refine_ls_weighting_details     
'w=1/[σ²(Fo²)+(0.0345P)²+0.0913P] where P=(Fo²+2Fc²)/3'
_atom_sites_solution_primary     difmap
_atom_sites_solution_secondary   difmap
_atom_sites_solution_hydrogens   difmap
_refine_ls_hydrogen_treatment    constr
_refine_ls_extinction_method     'shelxl-2018/3 (sheldrick 2018)'
_refine_ls_extinction_coef       0.0084(10)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc²λ³/sin(2θ)]^-1/4^
_refine_ls_abs_structure_details 
;
 Flack x determined using 1845 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.01(4)
_chemical_absolute_configuration ad
_refine_ls_number_reflns         3917
_refine_ls_number_parameters     302
_refine_ls_number_restraints     3
_refine_ls_number_constraints    ?
_refine_ls_R_factor_all          0.0219
_refine_ls_R_factor_gt           0.0219
_refine_ls_wR_factor_ref         0.0573
_refine_ls_wR_factor_gt          0.0572
_refine_ls_goodness_of_fit_ref   1.033
_refine_ls_restrained_S_all      1.033
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_diff_density_max         0.158
_refine_diff_density_min         -0.120
_refine_diff_density_rms         0.025

#===============================================================================

# ATOMIC COORDINATES AND DISPLACEMENT PARAMETERS

loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_thermal_displace_type
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
_atom_site_calc_flag
_atom_site_refinement_flags
_atom_site_disorder_assembly
_atom_site_disorder_group
O1 O Uani 0.34412(18) 0.24648(17) 0.62550(12) 1.000 0.0257(4) d . . .
O2 O Uani 0.72774(15) 0.29844(14) 0.81505(11) 1.000 0.0182(3) d . . .
O3 O Uani 0.86589(18) 0.47795(17) 0.82912(13) 1.000 0.0277(4) d . . .
C1 C Uani 0.5842(2) 0.4317(2) 0.52724(16) 1.000 0.0152(4) d . . .
C2 C Uani 0.6855(2) 0.5078(2) 0.41969(16) 1.000 0.0163(4) d . . .
C3 C Uani 0.8225(2) 0.5617(2) 0.43229(17) 1.000 0.0195(5) d . . .
C4 C Uani 0.9050(3) 0.6145(2) 0.31600(18) 1.000 0.0231(5) d . . .
C5 C Uani 0.8548(3) 0.6096(2) 0.18964(17) 1.000 0.0242(5) d . . .
C6 C Uani 0.7189(2) 0.5552(2) 0.17556(16) 1.000 0.0202(5) d . . .
C7 C Uani 0.6325(2) 0.5059(2) 0.29168(16) 1.000 0.0165(4) d . . .
C8 C Uani 0.4986(2) 0.4291(2) 0.30955(16) 1.000 0.0160(4) d . . .
C9 C Uani 0.4703(2) 0.3852(2) 0.44413(16) 1.000 0.0158(4) d . . .
C10 C Uani 0.3486(2) 0.3031(2) 0.50475(17) 1.000 0.0183(4) d . . .
C11 C Uani 0.4230(2) 0.3957(2) 0.19638(16) 1.000 0.0181(5) d . . .
C12 C Uani 0.3468(2) 0.5369(2) 0.08027(17) 1.000 0.0215(5) d . . .
C13 C Uani 0.2812(2) 0.5057(3) -0.02844(17) 1.000 0.0257(5) d . . .
C14 C Uani 0.2913(3) 0.3325(3) -0.02385(18) 1.000 0.0294(6) d . . .
C15 C Uani 0.3675(3) 0.1914(3) 0.08991(19) 1.000 0.0294(6) d . . .
C16 C Uani 0.4338(3) 0.2215(2) 0.19941(18) 1.000 0.0223(5) d . . .
C17 C Uani 0.4596(2) 0.5592(2) 0.62568(15) 1.000 0.0153(4) d . . .
C18 C Uani 0.2827(2) 0.7240(2) 0.55410(15) 1.000 0.0167(4) d . . .
C19 C Uani 0.2901(2) 0.8627(2) 0.44892(17) 1.000 0.0201(5) d . . .
C20 C Uani 0.1259(3) 1.0074(2) 0.38268(17) 1.000 0.0228(5) d . . .
C21 C Uani -0.0479(2) 1.0160(2) 0.41943(18) 1.000 0.0227(5) d . . .
C22 C Uani -0.0576(2) 0.8803(2) 0.52383(17) 1.000 0.0208(5) d . . .
C23 C Uani 0.1072(2) 0.7350(2) 0.59026(16) 1.000 0.0180(5) d . . .
C24 C Uani 0.5718(2) 0.6132(2) 0.70517(15) 1.000 0.0169(4) d . . .
C25 C Uani 0.5300(3) 0.7856(2) 0.71324(17) 1.000 0.0207(5) d . . .
C26 C Uani 0.7400(2) 0.4580(2) 0.78962(16) 1.000 0.0180(5) d . . .
C27 C Uani 0.8833(2) 0.1175(2) 0.88235(17) 1.000 0.0194(5) d . . .
C28 C Uani 0.8054(3) -0.0162(2) 0.87601(18) 1.000 0.0242(5) d . . .
C29 C Uani 1.0596(2) 0.0753(2) 0.80030(18) 1.000 0.0236(5) d . . .
C30 C Uani 0.9127(3) 0.1213(3) 1.02715(17) 1.000 0.0265(5) d . . .
H1 H Uiso 0.68047 0.31210 0.58270 1.000 0.0180 c RU . .
H3 H Uiso 0.85925 0.56240 0.51857 1.000 0.0230 c RU . .
H4 H Uiso 0.99676 0.65445 0.32298 1.000 0.0280 c RU . .
H5 H Uiso 0.91456 0.64401 0.11179 1.000 0.0290 c RU . .
H6 H Uiso 0.68537 0.55150 0.08920 1.000 0.0240 c RU . .
H10 H Uiso 0.26834 0.29330 0.44656 1.000 0.0220 c RU . .
H12 H Uiso 0.34001 0.65549 0.07604 1.000 0.0260 c RU . .
H13 H Uiso 0.22915 0.60288 -0.10643 1.000 0.0310 c RU . .
H14 H Uiso 0.24609 0.31114 -0.09840 1.000 0.0350 c RU . .
H15 H Uiso 0.37470 0.07292 0.09318 1.000 0.0350 c RU . .
H16 H Uiso 0.48662 0.12338 0.27677 1.000 0.0270 c RU . .
H17 H Uiso 0.41505 0.48119 0.69391 1.000 0.0180 c RU . .
H19 H Uiso 0.40851 0.85766 0.42273 1.000 0.0240 c RU . .
H20 H Uiso 0.13268 1.10098 0.31191 1.000 0.0270 c RU . .
H21 H Uiso -0.15989 1.11434 0.37331 1.000 0.0270 c RU . .
H22 H Uiso -0.17642 0.88634 0.55001 1.000 0.0250 c RU . .
H23 H Uiso 0.09966 0.64216 0.66128 1.000 0.0220 c RU . .
H25A H Uiso 0.60440 0.80528 0.76980 1.000 0.0250 c RU . .
H25B H Uiso 0.42568 0.88919 0.66245 1.000 0.0250 c RU . .
H28A H Uiso 0.77038 -0.00135 0.78227 1.000 0.0360 c RU . .
H28B H Uiso 0.69389 0.01125 0.93173 1.000 0.0360 c RU . .
H28C H Uiso 0.90168 -0.14487 0.90995 1.000 0.0360 c RU . .
H29A H Uiso 1.15889 -0.04943 0.83999 1.000 0.0350 c RU . .
H29B H Uiso 1.10237 0.16824 0.80071 1.000 0.0350 c RU . .
H29C H Uiso 1.03144 0.07970 0.70717 1.000 0.0350 c RU . .
H30A H Uiso 0.96483 0.20714 1.02743 1.000 0.0400 c RU . .
H30B H Uiso 1.00061 -0.00440 1.07515 1.000 0.0400 c RU . .
H30C H Uiso 0.79166 0.16351 1.07226 1.000 0.0400 c RU . .


#===============================================================================

# MOLECULAR GEOMETRY

_geom_special_details            
;
 Bond distances, angles etc. have been calculated using the
 rounded fractional coordinates. All su's are estimated
 from the variances of the (full) variance-covariance matrix.
 The cell esds are taken into account in the estimation of
 distances, angles and torsion angles
;

loop_
_geom_bond_atom_site_label_1
_geom_bond_atom_site_label_2
_geom_bond_distance
O1 C10 1.216(2)
O2 C26 1.338(2)
O2 C27 1.4837(19)
O3 C26 1.208(2)
C1 C2 1.509(2)
C1 C9 1.516(2)
C1 C17 1.566(2)
C2 C3 1.390(2)
C2 C7 1.407(2)
C3 C4 1.392(3)
C4 C5 1.392(3)
C5 C6 1.388(3)
C6 C7 1.399(2)
C7 C8 1.465(2)
C8 C9 1.364(2)
C8 C11 1.477(2)
C9 C10 1.459(2)
C11 C12 1.400(2)
C11 C16 1.399(2)
C12 C13 1.384(3)
C13 C14 1.390(3)
C14 C15 1.383(3)
C15 C16 1.389(3)
C17 C18 1.522(2)
C17 C24 1.524(2)
C18 C19 1.402(2)
C18 C23 1.392(2)
C19 C20 1.389(3)
C20 C21 1.387(3)
C21 C22 1.388(2)
C22 C23 1.394(2)
C24 C25 1.328(2)
C24 C26 1.510(2)
C27 C28 1.520(3)
C27 C29 1.517(2)
C27 C30 1.520(2)
C1 H1 1.0000
C3 H3 0.9500
C4 H4 0.9500
C5 H5 0.9500
C6 H6 0.9500
C10 H10 0.9500
C12 H12 0.9500
C13 H13 0.9500
C14 H14 0.9500
C15 H15 0.9500
C16 H16 0.9500
C17 H17 1.0000
C19 H19 0.9500
C20 H20 0.9500
C21 H21 0.9500
C22 H22 0.9500
C23 H23 0.9500
C25 H25A 0.9500
C25 H25B 0.9500
C28 H28A 0.9800
C28 H28B 0.9800
C28 H28C 0.9800
C29 H29A 0.9800
C29 H29B 0.9800
C29 H29C 0.9800
C30 H30A 0.9800
C30 H30B 0.9800
C30 H30C 0.9800

loop_
_geom_angle_atom_site_label_1
_geom_angle_atom_site_label_2
_geom_angle_atom_site_label_3
_geom_angle
C26 O2 C27 122.46(14)
C2 C1 C9 102.02(13)
C2 C1 C17 117.74(13)
C9 C1 C17 112.46(14)
C1 C2 C3 129.97(15)
C1 C2 C7 109.47(15)
C3 C2 C7 120.39(15)
C2 C3 C4 118.71(17)
C3 C4 C5 120.9(2)
C4 C5 C6 121.06(19)
C5 C6 C7 118.35(15)
C2 C7 C6 120.60(16)
C2 C7 C8 108.59(14)
C6 C7 C8 130.50(15)
C7 C8 C9 108.70(15)
C7 C8 C11 123.11(14)
C9 C8 C11 128.04(16)
C1 C9 C8 111.22(15)
C1 C9 C10 122.74(14)
C8 C9 C10 126.04(16)
O1 C10 C9 123.70(16)
C8 C11 C12 120.06(14)
C8 C11 C16 121.33(15)
C12 C11 C16 118.54(15)
C11 C12 C13 120.74(16)
C12 C13 C14 120.20(17)
C13 C14 C15 119.63(19)
C14 C15 C16 120.5(2)
C11 C16 C15 120.34(17)
C1 C17 C18 111.59(12)
C1 C17 C24 112.71(14)
C18 C17 C24 114.04(13)
C17 C18 C19 122.28(15)
C17 C18 C23 119.28(14)
C19 C18 C23 118.41(15)
C18 C19 C20 120.62(17)
C19 C20 C21 120.31(16)
C20 C21 C22 119.74(15)
C21 C22 C23 119.95(16)
C18 C23 C22 120.97(15)
C17 C24 C25 125.99(16)
C17 C24 C26 117.87(13)
C25 C24 C26 116.04(16)
O2 C26 O3 125.49(15)
O2 C26 C24 110.48(14)
O3 C26 C24 124.03(15)
O2 C27 C28 101.26(14)
O2 C27 C29 109.44(13)
O2 C27 C30 110.04(14)
C28 C27 C29 110.90(14)
C28 C27 C30 111.71(15)
C29 C27 C30 112.87(16)
C2 C1 H1 108.00
C9 C1 H1 108.00
C17 C1 H1 108.00
C2 C3 H3 121.00
C4 C3 H3 121.00
C3 C4 H4 120.00
C5 C4 H4 120.00
C4 C5 H5 119.00
C6 C5 H5 119.00
C5 C6 H6 121.00
C7 C6 H6 121.00
O1 C10 H10 118.00
C9 C10 H10 118.00
C11 C12 H12 120.00
C13 C12 H12 120.00
C12 C13 H13 120.00
C14 C13 H13 120.00
C13 C14 H14 120.00
C15 C14 H14 120.00
C14 C15 H15 120.00
C16 C15 H15 120.00
C11 C16 H16 120.00
C15 C16 H16 120.00
C1 C17 H17 106.00
C18 C17 H17 106.00
C24 C17 H17 106.00
C18 C19 H19 120.00
C20 C19 H19 120.00
C19 C20 H20 120.00
C21 C20 H20 120.00
C20 C21 H21 120.00
C22 C21 H21 120.00
C21 C22 H22 120.00
C23 C22 H22 120.00
C18 C23 H23 119.00
C22 C23 H23 120.00
C24 C25 H25A 120.00
C24 C25 H25B 120.00
H25A C25 H25B 120.00
C27 C28 H28A 109.00
C27 C28 H28B 109.00
C27 C28 H28C 109.00
H28A C28 H28B 109.00
H28A C28 H28C 109.00
H28B C28 H28C 109.00
C27 C29 H29A 109.00
C27 C29 H29B 109.00
C27 C29 H29C 109.00
H29A C29 H29B 109.00
H29A C29 H29C 109.00
H29B C29 H29C 109.00
C27 C30 H30A 109.00
C27 C30 H30B 109.00
C27 C30 H30C 109.00
H30A C30 H30B 109.00
H30A C30 H30C 109.00
H30B C30 H30C 109.00

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
C27 O2 C26 O3 -8.0(2)
C27 O2 C26 C24 172.80(13)
C26 O2 C27 C28 -175.55(14)
C26 O2 C27 C29 -58.42(18)
C26 O2 C27 C30 66.2(2)
C9 C1 C2 C3 -174.56(16)
C9 C1 C2 C7 0.61(16)
C17 C1 C2 C3 61.9(2)
C17 C1 C2 C7 -122.98(15)
C2 C1 C9 C8 -0.64(17)
C2 C1 C9 C10 179.04(14)
C17 C1 C9 C8 126.44(15)
C17 C1 C9 C10 -53.88(19)
C2 C1 C17 C18 70.44(19)
C2 C1 C17 C24 -59.40(18)
C9 C1 C17 C18 -47.72(18)
C9 C1 C17 C24 -177.56(13)
C1 C2 C3 C4 175.07(15)
C7 C2 C3 C4 0.4(2)
C1 C2 C7 C6 -174.66(14)
C1 C2 C7 C8 -0.40(18)
C3 C2 C7 C6 1.1(2)
C3 C2 C7 C8 175.31(14)
C2 C3 C4 C5 -1.4(2)
C3 C4 C5 C6 1.2(2)
C4 C5 C6 C7 0.3(2)
C5 C6 C7 C2 -1.3(2)
C5 C6 C7 C8 -174.19(16)
C2 C7 C8 C9 -0.02(18)
C2 C7 C8 C11 -175.99(14)
C6 C7 C8 C9 173.49(16)
C6 C7 C8 C11 -2.5(3)
C7 C8 C9 C1 0.43(18)
C7 C8 C9 C10 -179.24(15)
C11 C8 C9 C1 176.15(15)
C11 C8 C9 C10 -3.5(3)
C7 C8 C11 C12 -49.9(2)
C7 C8 C11 C16 126.99(19)
C9 C8 C11 C12 134.97(18)
C9 C8 C11 C16 -48.2(3)
C1 C9 C10 O1 -8.5(2)
C8 C9 C10 O1 171.18(16)
C8 C11 C12 C13 177.82(17)
C16 C11 C12 C13 0.9(3)
C8 C11 C16 C15 -177.8(2)
C12 C11 C16 C15 -0.9(3)
C11 C12 C13 C14 -0.4(3)
C12 C13 C14 C15 -0.1(3)
C13 C14 C15 C16 0.0(4)
C14 C15 C16 C11 0.5(4)
C1 C17 C18 C19 -64.0(2)
C1 C17 C18 C23 113.64(16)
C24 C17 C18 C19 65.19(19)
C24 C17 C18 C23 -117.22(16)
C1 C17 C24 C25 127.05(18)
C1 C17 C24 C26 -56.76(18)
C18 C17 C24 C25 -1.5(2)
C18 C17 C24 C26 174.67(14)
C17 C18 C19 C20 177.63(15)
C23 C18 C19 C20 0.0(2)
C17 C18 C23 C22 -177.75(14)
C19 C18 C23 C22 -0.1(2)
C18 C19 C20 C21 -0.3(2)
C19 C20 C21 C22 0.7(2)
C20 C21 C22 C23 -0.7(2)
C21 C22 C23 C18 0.4(2)
C17 C24 C26 O2 -20.1(2)
C17 C24 C26 O3 160.64(16)
C25 C24 C26 O2 156.48(16)
C25 C24 C26 O3 -22.8(3)

