4

Sn      0.225261246188482      0.297340497027062      0.101287470030950
Sn      1.210069478785038      1.521290975825676     -0.015467911156948
Sn      1.455890610619077     -0.143378439602920      1.549444808190721
Sn      0.258703921067455      1.776072977104481      1.266164124440447