Unusual Isomeric Corniculatolides from Mangrove, Aegiceras corniculatum.
Ponnapalli, M. Gowri; Annam, S Ch V A Rao; Ravirala, Saidulu; Sukki, Sushma; Ankireddy, Madhu; Tuniki, V. Raju; Journal of natural products 75 (2012) 275–279; doi:10.1021/np200789s

data_1503471
_publ_section_title
;
 Unusual Isomeric Corniculatolides from Mangrove, Aegiceras corniculatum.
;
_journal_issue                   2
_journal_name_full               'Journal of natural products'
_journal_page_first              275
_journal_page_last               279
_journal_paper_doi               10.1021/np200789s
_journal_volume                  75
_journal_year                    2012
_chemical_formula_moiety         'C18 H18 O4'
_chemical_formula_sum            'C18 H18 O4'
_chemical_formula_weight         298.32
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   8.3669(6)
_cell_length_b                   17.2652(12)
_cell_length_c                   20.0508(14)
_cell_measurement_reflns_used    7861
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      25.97
_cell_measurement_theta_min      2.36
_cell_volume                     2896.5(4)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'Bruker SHELXTL'
_computing_structure_solution    'Bruker SHELXTL'
_diffrn_ambient_temperature      298(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0354
_diffrn_reflns_av_sigmaI/netI    0.0184
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       -21
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            27980
_diffrn_reflns_theta_full        25.98
_diffrn_reflns_theta_max         25.98
_diffrn_reflns_theta_min         2.03
_exptl_absorpt_coefficient_mu    0.096
_exptl_absorpt_correction_T_max  0.9867
_exptl_absorpt_correction_T_min  0.9773
_exptl_absorpt_correction_type   empirical
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.368
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1264
_exptl_crystal_size_max          0.24
_exptl_crystal_size_mid          0.22
_exptl_crystal_size_min          0.14
_refine_diff_density_max         0.224
_refine_diff_density_min         -0.209
_refine_diff_density_rms         0.049
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.090
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     203
_refine_ls_number_reflns         2844
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.090
_refine_ls_R_factor_all          0.0436
_refine_ls_R_factor_gt           0.0409
_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/[\s^2^(Fo^2^)+(0.0395P)^2^+1.8202P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0950
_refine_ls_wR_factor_ref         0.0968
_reflns_number_gt                2672
_reflns_number_total             2844
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            np200789s_si_001.cif
_cod_data_source_block           prs11_m
_cod_original_sg_symbol_H-M      Pbca
_cod_database_code               1503471