def get_molec_uc_to_mg_g(isot_dict):
    """Fix the discrepancy coming from old Raspa calculations, having a typo in the conversion label."""
    if 'conversion_factor_molec_uc_to_gr_gr' in isot_dict.get_dict():
        molec_uc_to_mg_g = isot_dict['conversion_factor_molec_uc_to_gr_gr']
    elif 'conversion_factor_molec_uc_to_mg_g' in isot_dict.get_dict():
        molec_uc_to_mg_g = isot_dict['conversion_factor_molec_uc_to_mg_g']
    return molec_uc_to_mg_g
