very minimal
  Mrv0541 03051505542D          

  7  7  0  0  0  0            999 V2000
   -7.1819   -1.4953    0.0000 N   0  0  0  0  0  0  0  0  0  0  0  0
   -7.8964   -1.9078    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
   -6.5688   -2.0473    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
   -7.0956   -0.6748    0.0000 Mg  0  0  0  0  0  0  0  0  0  0  0  0
   -7.7249   -2.7148    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
   -6.9044   -2.8010    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
   -8.6501   -1.5722    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
  1  2  1  0  0  0  0
  1  3  2  0  0  0  0
  1  4  8  0  0  0  0
  2  5  1  0  0  0  0
  3  6  1  0  0  0  0
  5  6  2  0  0  0  0
  2  7  2  0  0  0  0
M  END