def get_dotted_field(input_dict, accessor_string):
    """Gets data from a dictionary using a dotted accessor-string
    
    :param input_dict: A nested dictionary
    :type input_dict: dict
    :param accessor_string: A dotted path description i.e. "DBLinks.KEGG"
    :type accessor_string: str
    :return: The value in the nested dict
    """
    current_data = input_dict
    for chunk in accessor_string.split('.'):
        current_data = current_data.get(chunk, {})
    return current_data