Mrv1805 11271910380D          

  0  0  0     0  0            999 V3000
M  V30 BEGIN CTAB
M  V30 COUNTS 1 0 0 0 0
M  V30 BEGIN ATOM
M  V30 1 Mg 0 0 0 0 VAL=-1
M  V30 END ATOM
M  V30 END CTAB
M  END