name= 'sodium'
symbol = 'Sod'

Sod = Atom('na')

amber_atom_type = {
                  Sod: 'IP',
                  }

pdbmap = [ ('SOD', {'NA': Sod} ) ]

amber_charge = {
               Sod: 1.0,
               }
configurations = {'default': Cartesian({Sod: (0.0,0.0,0.0),})}
