import pulsar as psr
def load_ref_system():
    """ Returns palmitic_acid as found in the IQMol fragment library.
        All credit to https://github.com/nutjunkie/IQmol
    """
    return psr.make_system("""
        C     -1.4019     -2.8272     -0.6667
        C     -1.6178     -4.1911     -0.0311
        C     -2.4090     -5.1050     -0.9536
        C     -2.6221     -6.4668     -0.3136
        C     -3.4009     -7.4048     -1.1969
        O     -3.8688     -7.2362     -2.3083
        O     -3.6109     -8.6336     -0.6618
        H     -2.3797     -2.3661     -0.9133
        H     -0.8748     -2.9407     -1.6356
        C     -0.6110     -1.9082      0.2503
        H     -2.1460     -4.0782      0.9373
        H     -0.6404     -4.6531      0.2156
        H     -1.8817     -5.2175     -1.9222
        H     -3.3862     -4.6433     -1.2007
        H     -3.1570     -6.3603      0.6525
        H     -1.6469     -6.9354     -0.0681
        H     -4.1069     -9.1705     -1.2721
        C     -0.3958     -0.5459     -0.3889
        H      0.3664     -2.3693      0.4979
        H     -1.1387     -1.7932      1.2185
        C      0.3944      0.3764      0.5253
        H     -1.3737     -0.0859     -0.6369
        H      0.1315     -0.6614     -1.3575
        C      0.6081      1.7378     -0.1164
        H      1.3723     -0.0832      0.7737
        H     -0.1332      0.4927      1.4935
        C      1.3977      2.6623      0.7961
        H     -0.3703      2.1965     -0.3648
        H      1.1352      1.6211     -1.0848
        H      2.3760      2.2039      1.0449
        H      0.8704      2.7796      1.7643
        C      1.6101      4.0230      0.1526
        C      2.3994      4.9492      1.0636
        H      0.6313      4.4807     -0.0960
        H      2.1369      3.9055     -0.8159
        H      3.3781      4.4916      1.3127
        H      1.8722      5.0674      2.0318
        C      2.6113      6.3093      0.4187
        C      3.4006      7.2360      1.3290
        H      1.6324      6.7667      0.1699
        H      3.1379      6.1911     -0.5499
        H      4.3791      6.7786      1.5793
        H      2.8734      7.3560      2.2969
        C      3.6149      8.5963      0.6846
        C      4.4000      9.5196      1.5887
        H      2.6365      9.0529      0.4349
        H      4.1416      8.4759     -0.2831
        H      5.3901      9.1084      1.8263
        H      3.8815      9.6906      2.5415
        H      4.5556     10.4993      1.1194
        """)
