methenamine hippurate [ 3M brand 1 of methenamine hippurate,Hip-Rex,3M brand 2 of methenamine hippurate,Aventis Behring brand of methenamine hippurate,Hiprex,Klinge brand of methenamine hippurate,United Drug brand of methenamine hippurate,Urex,Urotractan,hexamine hippurate ] both parts of molecule contribute to its antibacterial action