import pulsar as psr
def load_ref_system():
    """ Returns alpha-l-lyxopyranose as found in the IQMol fragment library.
        All credit to https://github.com/nutjunkie/IQmol
    """
    return psr.make_system("""
        C      1.1362      0.3733      0.6472
        O      0.0205      0.8861      1.4028
        C     -1.0609      1.3909      0.5933
        C     -1.6501      0.2787     -0.2850
        C     -0.5575     -0.4862     -1.0718
        O     -0.1813      0.4178     -2.1161
        C      0.6708     -0.8375     -0.2027
        O      1.6785     -1.1531     -1.1728
        O     -2.3992     -0.6551      0.4892
        O      2.0357     -0.0557      1.6468
        H     -0.6982      2.2393     -0.0163
        H     -1.7806      1.7449      1.3571
        H      1.6456      1.1664      0.0657
        H      0.4863     -1.7279      0.4354
        H     -0.9766     -1.4094     -1.5359
        H     -2.4073      0.6878     -1.0006
        H      1.5613     -0.2127      2.5004
        H      2.5304     -1.3555     -0.7210
        H      0.6446      0.0878     -2.5575
        H     -1.9081     -0.8988      1.3075
        """)
