Si2O.mol
  -ISIS-            3D

  3  3  0  0  0  0  0  0  0  0  0
   -0.6701   -0.7059    0.0000 O   0  0  0  0  0
    1.0648   -0.6053    0.0000 SI  0  0  0  0  0
   -0.6597    1.0322    0.0000 SI  0  0  0  0  0
  1  2  1  0  0  0
  1  3  1  0  0  0
  2  3  1  0  0  0