Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE documents ( document_structure_code VARCHAR )
TABLE: CREATE TABLE document_structures ( document_structure_description VARCHAR, document_structure_code VARCHAR )

### Question ###
What is the structure of the document with the least number of accesses?

### Accurate SQL ###

SELECT t2.document_structure_description FROM documents AS t1 JOIN document_structures AS t2 ON t1.document_structure_code = t2.document_structure_code GROUP BY t1.document_structure_code ORDER BY COUNT(*) DESC LIMIT 1