data_2000834 _journal_name_full 'Acta Cryst.' _journal_year 1992 _journal_volume C48 _journal_page_first 1074 _journal_page_last 1076 loop_ _publ_author_name 'Englehardt, U.' 'Stromburg, B.' _chemical_formula_sum 'C18 H22 N4 O4 P2' _chemical_formula_weight 420.346 _symmetry_cell_setting monoclinic _symmetry_space_group_name_H-M 'P 1 21/c 1' _symmetry_space_group_name_Hall '-P 2ybc' _cell_length_a 6.995(2) _cell_length_b 14.902(5) _cell_length_c 9.803(4) _cell_angle_alpha 90. _cell_angle_beta 110.33(3) _cell_angle_gamma 90. _cell_volume 958.0(10) _cell_formula_units_Z 2 _exptl_crystal_density_diffrn 1.457 _exptl_crystal_density_meas ? _exptl_crystal_F_000 440 _exptl_absorpt_coefficient_mu 0.25 _diffrn_radiation_type Mo _diffrn_radiation_wavelength 0.71069 loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv P .45200(10) .94268(4) .12364(7) .0374(4) O(1) .3275(3) .87500(10) .1596(2) .0500(10) O(2) .6317(3) .98400(10) .25700(10) .0420(10) N(1) .3202(3) 1.03290(10) .0413(2) .0370(10) N(2) .5611(3) .90580(10) .0119(2) .0370(10) C(1) .7843(4) .92620(10) .3479(2) .038(2) C(2) .9489(5) .9047(2) .3105(3) .048(2) C(3) 1.0950(5) .8485(2) .3986(3) .055(2) C(4) 1.0749(5) .8149(2) .5230(3) .053(2) C(5) .9102(5) .8383(2) .5600(3) .057(3) C(6) .7626(5) .8947(2) .4730(3) .050(2) C(7) .2268(5) 1.0921(2) .1207(3) .048(2) C(8) .6127(5) .8362(2) -.1894(3) .050(2) C(9) .4778(5) .8336(2) -.0966(3) .048(2)