18

C         1.1681569 -0.2550550  0.8756595 
C         1.3484628  0.1965789 -0.5826021 
C        -0.1630149  0.2550556  1.4507918 
C        -1.3484630 -0.1965791  0.5826038 
C        -1.1681567  0.2550548 -0.8756576 
C         0.1630149 -0.2550556 -1.4507899 
H        -1.4440620 -1.2992544  0.6239080 
H        -2.2954881  0.2017985  0.9917659 
H        -0.2922653 -0.1016823  2.4895446 
H        -0.1446071  1.3607175  1.5133326 
H         1.4440620  1.2992544 -0.6239060 
H         2.2954880 -0.2017985 -0.9917640 
H         2.0131366  0.1016836  1.4934968 
H         1.2010813 -1.3607168  0.9319297 
H         0.2922653  0.1016827 -2.4895433 
H         0.1446071 -1.3607176 -1.5133316 
H        -2.0131365 -0.1016835 -1.4934950 
H        -1.2010813  1.3607168 -0.9319277