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 table_19398910_4 (class VARCHAR, bout_6 VARCHAR)

### Question ###
when Sanchez ( esp ) w 5-0 were the bout 6, which were the class?

### Accurate SQL ###

SELECT class FROM table_19398910_4 WHERE bout_6 = "Sanchez ( ESP ) W 5-0"