import pulsar as psr
def load_ref_system():
    
""" Returns l-arginine as found in the IQMol fragment library.
        All credit to https://github.com/nutjunkie/IQmol
    """
    return psr.make_system("""
        N      0.8592     -2.9103     -0.8578
        C      1.3352     -1.5376     -1.1529
        C      2.8596     -1.5658     -1.1624
        O      3.6250     -1.8965     -0.2757
        O      3.4285     -1.1488     -2.3160
        C      0.8699     -0.4612     -0.1600
        H      1.4712      0.4581     -0.3123
        H      1.0768     -0.7804      0.8827
        C     -0.6054     -0.1308     -0.3266
        H     -1.2260     -1.0343     -0.1569
        H     -0.8065      0.1769     -1.3739
        C     -1.0120      0.9757      0.6424
        H     -0.4134      1.8919      0.4482
        H     -0.7821      0.6714      1.6839
        N     -2.4750      1.2329      0.5383
        H     -2.7251      1.4082     -0.4139
        C     -2.9738      2.2808      1.4124
        N     -3.4837      3.3356      0.8530
        H     -3.9046      4.0108      1.4410
        N     -2.8404      2.0695      2.8280
        H     -2.7215      1.1094      3.0676
        H     -3.5979      2.4725      3.3357
        H     -0.1386     -2.9250     -0.8895
        H      1.1675     -3.1979      0.0476
        H      0.9562     -1.2864     -2.1768
        H      4.3768     -1.2078     -2.2540
        """)