4

O      -0.149747312595736      0.019429025014992      0.294170819073454
Si      1.592115314874200      1.518550086950107     -0.041128063499261
Si      1.536913835829196      0.077365690355056      1.725773223142812
O       0.149777555970285      1.593644321539677      1.773541036547340