HMDB0000547
     RDKit          3D
Magnesium
  1  0  0  0  0  0  0  0  0  0999 V2000
    0.0000    0.0000    0.0000 Mg  0  0  0  0  0 15  0  0  0  0  0  0
M  CHG  1   1   2
M  END