user: Question: What is the coupon that has an issuer of COMMERZBANK AG?
Columns: ['Issuer', 'Issue Date', 'ISIN', 'Amount Issued [€]', 'Coupon', 'Maturity']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['HYPO REAL ESTATE', '11/13/2008', 'DE000A0XXY00', '15,000,000,000', '0.726', '12/23/2009']
SQL:

assistant: SELECT "Coupon" FROM "Table" WHERE "Issuer" = 'COMMERZBANK AG';