18

  C      3.999173   -0.917502    0.853330
  C      2.797630   -0.685809    0.267552
  C      1.595488   -0.309679    0.975636
  C      0.385357   -0.077152    0.376722
  C     -0.805779    0.297311    1.092264
  C     -2.046554    0.545728    0.557559
  C     -2.415398    0.482757   -0.840474
  C     -3.662107    0.742336   -1.307991
  H      4.883391   -1.201784    0.263904
  H      4.128186   -0.827734    1.944584
  H      2.708997   -0.786151   -0.829814
  H      1.671297   -0.205824    2.073947
  H      0.325283   -0.184747   -0.720572
  H     -0.697611    0.391827    2.186932
  H     -2.855672    0.823832    1.255097
  H     -1.630573    0.206541   -1.565785
  H     -3.900316    0.683428   -2.380417
  H     -4.480796    1.022622   -0.624517