def save_dotted_field(accessor_string, data):
    """Saves data to a dictionary using a dotted accessor-string
    
    :param accessor_string: A dotted path description i.e. "DBLinks.KEGG"
    :type accessor_string: str
    :param data: The value to be stored
    :return: A nested dictionary
    :rtype: dict
    """
    for chunk in accessor_string.split('.')[::-1]:
        data = {chunk: data}
    return data