text: import pulsar as psr
  def load_ref_system():
      """ Returns beta-d-fructopyranose as found in the IQMol fragment library.
          All credit to https://github.com/nutjunkie/IQmol
      """
      return psr.make_system("""
          C      1.5157     -1.4350     -0.0968
          C      1.0362     -0.0041     -0.4099
          O     -0.0001     -0.0908     -1.4209
          C     -1.3206     -0.4276     -0.9611
          C     -1.7712      0.5546      0.1317
          O     -2.9968      0.0291      0.6667
          C     -0.7807      0.5568      1.3181
          O     -0.7170     -0.7388      1.9299
          C      0.6584      0.8356      0.8364
          O      0.6865      2.2377      0.5675
          O      2.0241      0.7619     -1.0702
          O      1.6679     -2.1687     -1.3108
          H     -1.3335     -1.4683     -0.5878
          H     -1.9212     -0.3457     -1.8848
          H      1.3883      0.6507      1.6627
          H     -1.0841      1.3006      2.0905
          H     -1.9031      1.5836     -0.2644
          H      0.8039     -1.9539      0.5785
          H      2.5298     -1.4460      0.3475
          H      2.2237      0.3715     -1.9608
          H      1.1820      2.4227     -0.2754
          H     -1.6371     -1.0579      2.1114
          H     -3.7576      0.5868      0.4130
          H      0.8459     -2.0839     -1.8554
          """)
  