#------------------------------------------------------------------------------ #$Date: 2025-08-19 07:12:48 +0100 (Tue, 19 Aug 2025) $ #$Revision: 301798 $ #$URL: svn://www.crystallography.net/cod/cif/2/01/10/2011013.cif $ #------------------------------------------------------------------------------ # # This file is available in the Crystallography Open Database (COD), # http://www.crystallography.net/. The original data for this entry # were provided by IUCr Journals, http://journals.iucr.org/. # # The file may be used within the scientific community so long as # proper attribution is given to the journal article from which the # data were obtained. # data_2011013 loop_ _publ_author_name 'Meier, Herbert' 'Schwertel, Manfred' 'Schollmeyer, Dieter' _publ_section_title ; Two strained hexahelicenophanes ; _journal_issue 6 _journal_name_full 'Acta Crystallographica Section C' _journal_page_first 684 _journal_page_last 686 _journal_paper_doi 10.1107/S0108270100003140 _journal_volume 56 _journal_year 2000 _chemical_formula_sum 'C34 H30 O2' _chemical_formula_weight 470.58 _chemical_melting_point 243 _chemical_name_systematic ; 4,13-(1,8 octandioxy)-hexahelicen ; _space_group_IT_number 33 _symmetry_cell_setting orthorhombic _symmetry_space_group_name_Hall 'P 2c -2n' _symmetry_space_group_name_H-M 'P n a 21' _audit_creation_method SHELXL _cell_angle_alpha 90.00 _cell_angle_beta 90.00 _cell_angle_gamma 90.00 _cell_formula_units_Z 4 _cell_length_a 18.1447(4) _cell_length_b 12.3799(3) _cell_length_c 10.8228(3) _cell_measurement_reflns_used 25 _cell_measurement_temperature 298(2) _cell_measurement_theta_max 74 _cell_measurement_theta_min 66 _cell_volume 2431.12(10) _computing_cell_refinement CAD4-Software _computing_data_collection 'CAD4-Software (Enraf-Nonius, 1989)' _computing_data_reduction 'CORINC (Dr\"ager, 1971)' _computing_molecular_graphics 'ORTEPII (Johnson, 1976)' _computing_structure_refinement 'SHELXL97 (Sheldrick, 1997)' _computing_structure_solution 'SIR92 (Altomare, 1994)' _diffrn_ambient_temperature 298(2) _diffrn_measured_fraction_theta_full 1.000 _diffrn_measured_fraction_theta_max 1.000 _diffrn_measurement_device 'CAD4 Enraf Nonius' _diffrn_measurement_method \w/2\q _diffrn_radiation_monochromator graphite _diffrn_radiation_source 'rotating anode' _diffrn_radiation_type CuK\a _diffrn_radiation_wavelength 1.54178 _diffrn_reflns_av_R_equivalents .0000 _diffrn_reflns_av_sigmaI/netI .0178 _diffrn_reflns_limit_h_max 22 _diffrn_reflns_limit_h_min -22 _diffrn_reflns_limit_k_max 15 _diffrn_reflns_limit_k_min -15 _diffrn_reflns_limit_l_max 13 _diffrn_reflns_limit_l_min -13 _diffrn_reflns_number 4962 _diffrn_reflns_theta_full 74.97 _diffrn_reflns_theta_max 74.97 _diffrn_reflns_theta_min 4.32 _diffrn_standards_decay_% 5 _diffrn_standards_interval_time 60 _diffrn_standards_number 3 _exptl_absorpt_coefficient_mu .606 _exptl_absorpt_correction_type none _exptl_crystal_colour yellow _exptl_crystal_density_diffrn 1.286 _exptl_crystal_density_method 'not measured' _exptl_crystal_description 'rectangular block' _exptl_crystal_F_000 1000 _exptl_crystal_size_max .41 _exptl_crystal_size_mid .41 _exptl_crystal_size_min .32 _refine_diff_density_max .340 _refine_diff_density_min -.177 _refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881' _refine_ls_abs_structure_Flack -.1(3) _refine_ls_extinction_coef .0050(3) _refine_ls_extinction_method 'SHELXL97 (Sheldrick, 1997)' _refine_ls_goodness_of_fit_ref 1.068 _refine_ls_hydrogen_treatment constr _refine_ls_matrix_type full _refine_ls_number_parameters 348 _refine_ls_number_reflns 4962 _refine_ls_number_restraints 1 _refine_ls_restrained_S_all 1.032 _refine_ls_R_factor_all .0398 _refine_ls_R_factor_gt .0391 _refine_ls_shift/esd_mean .000 _refine_ls_shift/su_max .001 _refine_ls_structure_factor_coef Fsqd _refine_ls_weighting_details 'w = 1/[\s^2^(Fo^2^)+( 0.0742P)^2^+0.2614P] where P=(Fo^2^+2Fc^2^)/3' _refine_ls_weighting_scheme calc _refine_ls_wR_factor_all .1122 _refine_ls_wR_factor_ref .1112 _reflns_number_gt 4855 _reflns_number_total 4962 _reflns_threshold_expression I>2\s(I) _cod_data_source_file jz1383.cif _cod_data_source_block II _cod_depositor_comments ; The following automatic conversions were performed: '_refine_ls_weighting_scheme' value 'calc w = 1/[\s^2^(Fo^2^)+( 0.0742P)^2^+0.2614P] where P=(Fo^2^+2Fc^2^)/3' was changed to 'calc'. New tag '_refine_ls_weighting_details' was created. The value of the new tag was set to 'w = 1/[\s^2^(Fo^2^)+( 0.0742P)^2^+0.2614P] where P=(Fo^2^+2Fc^2^)/3'. Automatic conversion script Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas ; _cod_database_code 2011013 _cod_database_fobs_code 2011013 loop_ _symmetry_equiv_pos_as_xyz 'x, y, z' '-x, -y, z+1/2' '-x+1/2, y+1/2, z+1/2' 'x+1/2, -y+1/2, z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv _atom_site_adp_type _atom_site_calc_flag _atom_site_refinement_flags _atom_site_occupancy _atom_site_disorder_assembly _atom_site_disorder_group _atom_site_type_symbol O1 .93523(7) -.06201(10) .21811(15) .0575(4) Uani d . 1 . . O O2 .65710(7) .44666(10) .29553(15) .0579(3) Uani d . 1 . . O C1 .75394(9) .04490(13) .41749(15) .0397(3) Uani d . 1 . . C H1 .7128 .0717 .4587 .041(5) Uiso calc R 1 . . H C2 .82178(9) .08815(14) .44095(16) .0437(3) Uani d . 1 . . C H2 .8264 .1416 .5008 .042(5) Uiso calc R 1 . . H C3 .88432(9) .05371(14) .37685(17) .0465(4) Uani d . 1 . . C H3 .9299 .0854 .3923 .051(5) Uiso calc R 1 . . H C4 .87797(9) -.02715(12) .29106(17) .0435(3) Uani d . 1 . . C C4A .80975(9) -.08165(12) .27443(15) .0411(3) Uani d . 1 . . C C5 .80609(11) -.18125(14) .20703(17) .0501(4) Uani d . 1 . . C H5 .8474 -.2063 .1649 .043(5) Uiso calc R 1 . . H C6 .74299(12) -.23865(13) .20462(19) .0546(4) Uani d . 1 . . C H6 .7431 -.3072 .1694 .069(7) Uiso calc R 1 . . H C6A .67602(10) -.19685(14) .25484(16) .0480(4) Uani d . 1 . . C C7 .61018(12) -.25995(16) .25756(19) .0582(5) Uani d . 1 . . C H7 .6095 -.3273 .2195 .081(8) Uiso calc R 1 . . H C8 .54900(12) -.22331(17) .31458(19) .0599(5) Uani d . 1 . . C H8 .5087 -.2690 .3236 .072(7) Uiso calc R 1 . . H C8A .54502(10) -.11591(15) .36120(18) .0518(4) Uani d . 1 . . C C9 .48470(10) -.07768(19) .4338(2) .0622(5) Uani d . 1 . . C H9 .4443 -.1224 .4474 .081(8) Uiso calc R 1 . . H C10 .48544(10) .02253(19) .4831(2) .0602(5) Uani d . 1 . . C H10 .4512 .0409 .5434 .071(7) Uiso calc R 1 . . H C10A .53821(9) .10030(16) .44330(16) .0493(4) Uani d . 1 . . C C11 .53627(10) .20997(17) .48409(17) .0538(4) Uani d . 1 . . C H11 .5044 .2296 .5476 .060(6) Uiso calc R 1 . . H C12 .58021(9) .28623(16) .43163(18) .0504(4) Uani d . 1 . . C H12 .5824 .3552 .4655 .060(6) Uiso calc R 1 . . H C12A .62313(8) .26065(13) .32438(16) .0414(3) Uani d . 1 . . C C13 .65593(9) .34202(13) .25103(17) .0456(4) Uani d . 1 . . C C14 .68265(10) .31985(15) .13612(18) .0497(4) Uani d . 1 . . C H14 .6992 .3754 .0854 .051(5) Uiso calc R 1 . . H C15 .68502(9) .21235(14) .09500(16) .0452(4) Uani d . 1 . . C H15 .7033 .1970 .0167 .060(6) Uiso calc R 1 . . H C16 .66066(8) .12967(13) .16893(15) .0402(3) Uani d . 1 . . C H16 .6657 .0585 .1427 .039(5) Uiso calc R 1 . . H C16A .62805(8) .15183(12) .28441(14) .0376(3) Uani d . 1 . . C C16B .59276(8) .06875(13) .35795(15) .0419(3) Uani d . 1 . . C C16C .60533(9) -.04521(14) .34002(15) .0428(3) Uani d . 1 . . C C16D .67517(9) -.09163(13) .30543(15) .0411(3) Uani d . 1 . . C C16E .74542(8) -.04008(12) .33142(14) .0378(3) Uani d . 1 . . C C17 .98596(9) .01887(15) .1737(2) .0535(4) Uani d . 1 . . C H171 1.0297 -.0167 .1420 .067(5) Uiso calc R 1 . . H H172 1.0009 .0642 .2424 .067(5) Uiso calc R 1 . . H C18 .95384(13) .08957(17) .07326(19) .0592(5) Uani d . 1 . . C H181 .9278 .0430 .0160 .092(7) Uiso calc R 1 . . H H182 .9946 .1216 .0283 .092(7) Uiso calc R 1 . . H C19 .90134(11) .18107(15) .11024(18) .0517(4) Uani d . 1 . . C H191 .8795 .2114 .0362 .053(4) Uiso calc R 1 . . H H192 .8618 .1514 .1602 .053(4) Uiso calc R 1 . . H C20 .93925(10) .27097(15) .1823(2) .0532(4) Uani d . 1 . . C H201 .9529 .2432 .2629 .070(5) Uiso calc R 1 . . H H202 .9844 .2902 .1396 .070(5) Uiso calc R 1 . . H C21 .89364(12) .37301(15) .2005(2) .0589(5) Uani d . 1 . . C H211 .9267 .4317 .2218 .062(5) Uiso calc R 1 . . H H212 .8705 .3913 .1224 .062(5) Uiso calc R 1 . . H C22 .83492(11) .36593(15) .2975(2) .0591(5) Uani d . 1 . . C H221 .8572 .3507 .3770 .058(4) Uiso calc R 1 . . H H222 .8013 .3075 .2778 .058(4) Uiso calc R 1 . . H C23 .79186(12) .47374(16) .3043(3) .0729(7) Uani d . 1 . . C H231 .8232 .5267 .3441 .130(10) Uiso calc R 1 . . H H232 .7834 .4985 .2204 .130(10) Uiso calc R 1 . . H C24 .72014(12) .47311(17) .3695(3) .0708(6) Uani d . 1 . . C H241 .7231 .4217 .4370 .079(6) Uiso calc R 1 . . H H242 .7124 .5440 .4054 .079(6) Uiso calc R 1 . . H loop_ _atom_site_aniso_label _atom_site_aniso_U_11 _atom_site_aniso_U_22 _atom_site_aniso_U_33 _atom_site_aniso_U_12 _atom_site_aniso_U_13 _atom_site_aniso_U_23 O1 .0492(7) .0460(6) .0774(9) .0061(5) .0175(7) -.0034(6) O2 .0490(6) .0421(6) .0827(10) .0028(5) -.0052(7) -.0106(6) C1 .0415(8) .0413(7) .0363(7) .0021(6) -.0017(6) -.0010(6) C2 .0482(8) .0433(8) .0398(8) -.0018(6) -.0047(7) -.0055(6) C3 .0400(8) .0473(8) .0523(9) -.0050(6) -.0038(7) .0001(7) C4 .0417(8) .0397(7) .0491(8) .0059(6) .0028(7) .0022(7) C4A .0473(8) .0362(7) .0399(8) .0022(6) -.0016(7) .0018(6) C5 .0596(10) .0400(8) .0506(9) .0041(7) .0028(8) -.0062(7) C6 .0745(12) .0355(7) .0539(10) -.0010(7) -.0056(9) -.0082(7) C6A .0590(10) .0409(8) .0440(8) -.0105(7) -.0091(7) .0027(6) C7 .0729(12) .0473(9) .0544(10) -.0203(9) -.0144(9) .0018(8) C8 .0602(11) .0577(10) .0616(11) -.0278(9) -.0164(9) .0163(9) C8A .0445(9) .0590(10) .0519(9) -.0130(8) -.0087(7) .0170(8) C9 .0393(9) .0777(14) .0696(12) -.0148(9) -.0036(9) .0271(11) C10 .0381(9) .0847(14) .0579(11) .0021(9) .0074(8) .0213(10) C10A .0378(8) .0673(11) .0428(8) .0041(7) .0000(7) .0104(8) C11 .0441(9) .0721(12) .0451(9) .0104(8) .0040(7) -.0029(8) C12 .0425(8) .0574(10) .0513(9) .0077(7) -.0042(7) -.0094(8) C12A .0325(7) .0455(8) .0461(8) .0032(6) -.0066(6) -.0030(6) C13 .0386(7) .0398(8) .0583(10) .0002(6) -.0051(7) -.0029(7) C14 .0506(10) .0429(8) .0555(10) -.0090(7) -.0018(7) .0062(7) C15 .0470(9) .0486(9) .0400(8) -.0078(7) .0002(7) -.0005(7) C16 .0388(7) .0407(7) .0410(7) -.0048(6) -.0030(6) -.0034(6) C16A .0312(6) .0423(7) .0394(7) -.0015(5) -.0044(6) .0006(6) C16B .0339(7) .0492(8) .0426(8) -.0024(6) -.0039(6) .0046(7) C16C .0407(8) .0477(8) .0400(7) -.0086(6) -.0034(6) .0076(6) C16D .0454(8) .0399(7) .0381(7) -.0054(6) -.0051(6) .0049(6) C16E .0407(8) .0364(7) .0361(7) -.0004(6) -.0032(6) .0040(5) C17 .0384(9) .0533(10) .0688(12) .0062(7) .0084(8) .0011(9) C18 .0686(12) .0554(11) .0536(10) .0084(9) .0063(9) -.0011(8) C19 .0542(10) .0518(9) .0491(9) .0061(8) -.0056(8) .0028(8) C20 .0493(9) .0504(9) .0597(10) .0016(7) -.0030(8) .0023(8) C21 .0654(11) .0445(9) .0669(12) .0019(8) -.0108(10) .0022(9) C22 .0484(9) .0460(9) .0827(14) .0006(7) -.0065(9) -.0102(9) C23 .0560(11) .0451(10) .118(2) -.0010(8) -.0014(13) -.0146(11) C24 .0589(12) .0510(10) .1026(18) -.0013(9) -.0069(11) -.0259(12) loop_ _atom_type_symbol _atom_type_description _atom_type_scat_dispersion_real _atom_type_scat_dispersion_imag _atom_type_scat_source C C .0181 .0091 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' H H .0000 .0000 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' O O .0492 .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 C4 O1 C17 117.12(13) C13 O2 C24 114.87(14) C2 C1 C16E 120.84(15) C1 C2 C3 121.34(16) C4 C3 C2 119.42(16) C3 C4 O1 123.72(16) C3 C4 C4A 120.39(15) O1 C4 C4A 115.88(15) C16E C4A C4 119.34(14) C16E C4A C5 119.71(15) C4 C4A C5 120.85(15) C6 C5 C4A 120.16(17) C5 C6 C6A 121.63(16) C16D C6A C7 119.16(18) C16D C6A C6 119.39(15) C7 C6A C6 121.43(18) C8 C7 C6A 120.94(19) C7 C8 C8A 121.20(17) C16C C8A C8 118.64(18) C16C C8A C9 118.37(18) C8 C8A C9 122.91(17) C10 C9 C8A 120.94(17) C9 C10 C10A 120.56(19) C16B C10A C10 118.87(19) C16B C10A C11 118.91(16) C10 C10A C11 122.19(18) C12 C11 C10A 121.10(17) C11 C12 C12A 120.22(17) C13 C12A C16A 118.63(15) C13 C12A C12 121.74(16) C16A C12A C12 119.42(16) C14 C13 O2 120.09(17) C14 C13 C12A 121.24(16) O2 C13 C12A 118.59(16) C13 C14 C15 119.41(16) C16 C15 C14 120.82(16) C15 C16 C16A 120.47(15) C16 C16A C12A 118.80(14) C16 C16A C16B 122.29(14) C12A C16A C16B 118.61(14) C10A C16B C16C 118.06(15) C10A C16B C16A 118.27(15) C16C C16B C16A 123.39(15) C8A C16C C16D 118.28(16) C8A C16C C16B 117.35(16) C16D C16C C16B 124.35(14) C6A C16D C16C 118.55(15) C6A C16D C16E 118.05(15) C16C C16D C16E 123.10(14) C1 C16E C4A 117.85(13) C1 C16E C16D 123.39(14) C4A C16E C16D 118.61(14) O1 C17 C18 113.29(16) C17 C18 C19 118.65(17) C20 C19 C18 113.13(16) C21 C20 C19 115.26(16) C22 C21 C20 115.35(17) C21 C22 C23 109.97(19) C24 C23 C22 117.5(2) O2 C24 C23 115.9(2) loop_ _geom_bond_atom_site_label_1 _geom_bond_atom_site_label_2 _geom_bond_site_symmetry_2 _geom_bond_distance _geom_bond_publ_flag O1 C4 . 1.374(2) ? O1 C17 . 1.443(2) ? O2 C13 . 1.382(2) ? O2 C24 . 1.434(3) ? C1 C2 . 1.366(2) ? C1 C16E . 1.414(2) ? C2 C3 . 1.397(2) ? C3 C4 . 1.370(2) ? C4 C4A . 1.421(2) ? C4A C16E . 1.417(2) ? C4A C5 . 1.434(2) ? C5 C6 . 1.348(3) ? C6 C6A . 1.428(3) ? C6A C16D . 1.413(2) ? C6A C7 . 1.428(3) ? C7 C8 . 1.349(3) ? C8 C8A . 1.424(3) ? C8A C16C . 1.420(2) ? C8A C9 . 1.428(3) ? C9 C10 . 1.350(3) ? C10 C10A . 1.424(3) ? C10A C16B . 1.409(2) ? C10A C11 . 1.428(3) ? C11 C12 . 1.360(3) ? C12 C12A . 1.433(2) ? C12A C13 . 1.414(2) ? C12A C16A . 1.418(2) ? C13 C14 . 1.363(3) ? C14 C15 . 1.404(3) ? C15 C16 . 1.372(2) ? C16 C16A . 1.410(2) ? C16A C16B . 1.450(2) ? C16B C16C . 1.442(2) ? C16C C16D . 1.441(2) ? C16D C16E . 1.453(2) ? C17 C18 . 1.512(3) ? C18 C19 . 1.533(3) ? C19 C20 . 1.523(3) ? C20 C21 . 1.523(3) ? C21 C22 . 1.499(3) ? C22 C23 . 1.548(3) ? C23 C24 . 1.480(3) ? 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 C16E C1 C2 C3 3.1(3) C1 C2 C3 C4 -1.8(3) C2 C3 C4 O1 175.90(16) C2 C3 C4 C4A -5.1(3) C17 O1 C4 C3 -37.4(3) C17 O1 C4 C4A 143.53(16) C3 C4 C4A C16E 10.7(2) O1 C4 C4A C16E -170.23(14) C3 C4 C4A C5 -165.59(16) O1 C4 C4A C5 13.5(2) C16E C4A C5 C6 -4.3(3) C4 C4A C5 C6 171.96(18) C4A C5 C6 C6A 7.9(3) C5 C6 C6A C16D 1.7(3) C5 C6 C6A C7 -176.88(18) C16D C6A C7 C8 -4.3(3) C6 C6A C7 C8 174.28(18) C6A C7 C8 C8A 7.5(3) C7 C8 C8A C16C 3.8(3) C7 C8 C8A C9 -172.92(19) C16C C8A C9 C10 -1.2(3) C8 C8A C9 C10 175.55(19) C8A C9 C10 C10A 13.3(3) C9 C10 C10A C16B -4.3(3) C9 C10 C10A C11 173.73(18) C16B C10A C11 C12 7.7(3) C10 C10A C11 C12 -170.30(18) C10A C11 C12 C12A 7.4(3) C11 C12 C12A C13 165.37(17) C11 C12 C12A C16A -9.3(2) C24 O2 C13 C14 -94.4(2) C24 O2 C13 C12A 88.8(2) C16A C12A C13 C14 9.2(2) C12 C12A C13 C14 -165.53(16) C16A C12A C13 O2 -174.10(13) C12 C12A C13 O2 11.1(2) O2 C13 C14 C15 176.34(16) C12A C13 C14 C15 -7.0(3) C13 C14 C15 C16 .1(3) C14 C15 C16 C16A 4.4(2) C15 C16 C16A C12A -2.1(2) C15 C16 C16A C16B 171.57(15) C13 C12A C16A C16 -4.6(2) C12 C12A C16A C16 170.31(14) C13 C12A C16A C16B -178.41(14) C12 C12A C16A C16B -3.5(2) C10 C10A C16B C16C -16.4(2) C11 C10A C16B C16C 165.55(15) C10 C10A C16B C16A 157.72(16) C11 C10A C16B C16A -20.4(2) C16 C16A C16B C10A -155.39(15) C12A C16A C16B C10A 18.2(2) C16 C16A C16B C16C 18.4(2) C12A C16A C16B C16C -168.01(14) C8 C8A C16C C16D -17.7(2) C9 C8A C16C C16D 159.12(16) C8 C8A C16C C16B 163.88(16) C9 C8A C16C C16B -19.3(2) C10A C16B C16C C8A 27.9(2) C16A C16B C16C C8A -145.83(16) C10A C16B C16C C16D -150.36(16) C16A C16B C16C C16D 35.9(2) C7 C6A C16D C16C -9.8(2) C6 C6A C16D C16C 171.57(16) C7 C6A C16D C16E 164.12(16) C6 C6A C16D C16E -14.5(2) C8A C16C C16D C6A 20.7(2) C16B C16C C16D C6A -161.05(16) C8A C16C C16D C16E -152.92(16) C16B C16C C16D C16E 25.4(2) C2 C1 C16E C4A 2.6(2) C2 C1 C16E C16D 177.99(15) C4 C4A C16E C1 -9.2(2) C5 C4A C16E C1 167.08(15) C4 C4A C16E C16D 175.09(14) C5 C4A C16E C16D -8.6(2) C6A C16D C16E C1 -157.62(15) C16C C16D C16E C1 16.0(2) C6A C16D C16E C4A 17.8(2) C16C C16D C16E C4A -168.59(15) C4 O1 C17 C18 -72.9(2) O1 C17 C18 C19 78.5(2) C17 C18 C19 C20 67.6(2) C18 C19 C20 C21 169.03(18) C19 C20 C21 C22 76.7(2) C20 C21 C22 C23 -178.75(18) C21 C22 C23 C24 164.1(2) C13 O2 C24 C23 66.0(3) C22 C23 C24 O2 -88.4(3) loop_ _cod_related_entry_id _cod_related_entry_database _cod_related_entry_code 1 ChemSpider 555605 2 PubChem 640242