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_21692771_1 (coupon VARCHAR, issuer VARCHAR)

### Question ###
What is the coupon that has an issuer of Commerzbank AG?

### Accurate SQL ###

SELECT coupon FROM table_21692771_1 WHERE issuer = "COMMERZBANK AG"