data_2000603
_journal_name_full  'Acta Cryst.'
_journal_year  1992
_journal_volume  C48
_journal_page_first  1635
_journal_page_last  1637
loop_
_publ_author_name
 'Valento, E.J.'
 'Ruggiero, G.'
 'Eggleston, D.S.'
_chemical_formula_sum  'C20 H16 O4'
_chemical_formula_weight  320.35
_symmetry_cell_setting  monoclinic
_symmetry_space_group_name_H-M  'P 21/n'
_symmetry_space_group_name_Hall  ?
_cell_length_a  10.482(3)
_cell_length_b  8.0840(10)
_cell_length_c  18.081(4)
_cell_angle_alpha  90.
_cell_angle_beta  92.59(2)
_cell_angle_gamma  90.
_cell_volume  1530.5(5)
_cell_formula_units_Z  4
_exptl_crystal_density_diffrn  1.39
_exptl_crystal_density_meas  ?
_exptl_crystal_F_000  672
_exptl_absorpt_coefficient_mu  0.0902
_diffrn_radiation_type  Mo
_diffrn_radiation_wavelength  0.70930
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
 O(1) .6089(2) .3962(3) .10480(10)
 O(2) .5570(2) .4666(3) .21750(10)
 O(3) .2526(2) .1969(3) .05850(10)
 O(4) .0985(2) .3618(3) .10910(10)
 C(2) .5228(3) .3975(4) .1608(2)
 C(3) .4011(3) .3184(4) .1465(2)
 C(4) .3694(3) .2586(4) .0780(2)
 C(5) .4603(3) .2534(4) .0207(2)
 C(6) .4369(3) .1807(4) -.0489(2)
 C(7) .5311(3) .1768(4) -.0993(2)
 C(8) .6491(4) .2470(5) -.0816(2)
 C(9) .6756(3) .3214(4) -.0134(2)
 C(10) .5797(3) .3225(4) .0373(2)
 C(11) .3090(3) .3067(4) .2082(2)
 C(12) .2181(3) .1644(4) .1891(2)
 C(13) .1560(3) .2019(4) .1134(2)
 C(14) .1268(3) .4796(4) .1632(2)
 C(15) .2305(3) .4631(4) .2135(2)
 C(16) .2541(3) .5871(4) .2652(2)
 C(17) .1766(3) .7255(4) .2661(2)
 C(18) .0739(3) .7399(4) .2154(2)
 C(19) .0460(3) .6159(4) .1631(2)
 C(20) -.0675(3) .6305(4) .1085(2)
 C(21) .0545(3) .0825(4) .0862(2)
 H5 .8404 .5371 .7220
 H6 .8144 .3183 .7116
 H7 .6145 .2298 .7088
 H8 .4343 .3575 .7165
 H11 .4903 .9403 .8113
 H121 .6983 1.0239 .8353
 H122 .6897 .8856 .8836
 H141 .9764 .8687 .7419
 H142 .9230 .8494 .8534
 H143 .9344 .9887 .8072
 H18 .5748 1.1870 .4494
 H19 .3847 1.1620 .5344
 H20 .3747 1.0344 .6762
 H211 .7890 1.1510 .4316
 H212 .8348 1.0142 .4678
 H213 .8629 1.1358 .5358