data_2000758
_journal_name_full  'Acta Cryst.'
_journal_year  1992
_journal_volume  C48
_journal_page_first  1252
_journal_page_last  1253
loop_
_publ_author_name
 'Whitby, R.J.'
 'Webster, M.'
 'Dennehy, R.D.'
_chemical_formula_sum  'C25 H27 N5 Si1'
_chemical_formula_weight  425.61
_symmetry_cell_setting  orthorhombic
_symmetry_space_group_name_H-M  'P b c a'
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_cell_length_a  16.454(3)
_cell_length_b  17.353(3)
_cell_length_c  17.6740(10)
_cell_angle_alpha  90.
_cell_angle_beta  90.
_cell_angle_gamma  90.
_cell_volume  5046.4
_cell_formula_units_Z  8
_exptl_crystal_density_diffrn  1.120
_exptl_crystal_density_meas  1.11(2)
_exptl_crystal_F_000  1808
_exptl_absorpt_coefficient_mu  0.083
_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
 Si(1) .71723(8) .12391(6) .28210(6) .0502(7)
 N(1) .6589(3) .4335(2) .0675(2) .082(3)
 N(2) .4283(3) .3362(3) .1261(2) .81(3)
 N(3) .6074(2) .2481(2) -.0333(2) .66(3)
 N(4) .5181(2) .1334(2) .1578(2) .75(3)
 N(5) .7565(2) .2452(2) .1008(2) .49(2)
 C(1) .6077(2) .3363(2) .2305(2) .38(2)
 C(2) .5852(2) .3263(2) .1462(2) .39(2)
 C(3) .6138(2) .2449(2) .1146(2) .38(2)
 C(4) .7008(2) .2328(2) .1477(2) .39(2)
 C(5) .6923(2) .2173(2) .2302(2) .39(2)
 C(6) .6471(2) .2702(2) .2668(2) .40(2)
 C(7) .5897(2) .4019(2) .2690(2) .041(2)
 C(8) .5397(3) .4671(2) .2364(2) .63(3)
 C(9) .6234(2) .4156(2) .3454(2) .43(2)
 C(10) .7043(2) .4023(2) .3622(2) .49(3)
 C(11) .7355(3) .4197(3) .4324(2) .61(3)
 C(12) .6867(3) .4488(3) .4873(2) .67(3)
 C(13) .6060(3) .4620(3) .4726(2) .74(4)
 C(14) .5744(3) .4464(2) .4021(2) .58(3)
 C(15) .6271(3) .3865(2) .1000(2) .50(3)
 C(16) .4969(3) .3336(2) .1343(2) .049(3)
 C(17) .6127(2) .2463(2) .0306(2) .046(3)
 C(18) .5589(2) .1829(2) .1397(2) .046(3)
 C(19) .8442(3) .2526(3) .1171(2) .062(3)
 C(20) .8774(4) .3022(6) .0578(5) .200(9)
 C(21) .8837(5) .1790(5) .1061(7) .238(11)
 C(22) .8648(4) .2789(8) .1905(4) .256(11)
 C(23) .7323(4) .0466(3) .2102(2) .087(4)
 C(24) .8027(3) .1379(4) .3482(3) .098(5)
 C(25) .6257(3) .0977(3) .3383(2) .073(4)
 H(6) .6403 .2642 .3198 .063(5)
 H(8A) .5314 .4618 .1835 .165(6)
 H(8B) .5751 .5093 .2456 .165(6)
 H(8C) .4891 .4761 .2606 .165(6)
 H(10) .7388 .3808 .3247 .063(5)
 H(11) .7915 .4112 .4425 .063(5)
 H(12) .7084 .4602 .5358 .063(5)
 H(13) .5717 .4818 .5112 .063(5)
 H(14) .5188 .4567 .3920 .063(5)
 H(20A) .8519 .3484 .0741 .165(6)
 H(20B) .8573 .2884 .0092 .165(6)
 H(20C) .9344 .3100 .0550 .165(6)
 H(21A) .8611 .1413 .1390 .165(6)
 H(21B) .9410 .1798 .1119 .165(6)
 H(21C) .8704 .1666 .0552 .165(6)
 H(22A) .8374 .3271 .1904 .165(6)
 H(22B) .9218 .2873 .1890 .165(6)
 H(22C) .8513 .2514 .2353 .165(6)
 H(23A) .7821 .0568 .1850 .165(6)
 H(23B) .6895 .0445 .1742 .165(6)
 H(23C) .7360 -.0013 .2359 .165(6)
 H(24A) .8543 .1472 .3259 .165(6)
 H(24B) .8048 .0918 .3771 .165(6)
 H(24C) .7888 .1798 .3804 .165(6)
 H(25A) .6194 .1373 .3749 .165(6)
 H(25B) .6371 .0503 .3630 .165(6)
 H(25C) .5770 .0929 .3098 .165(6)