The nitrate which does not undergo first pass metabolism is

Isosorbide mononitrate, is a medication used for hea related chest pain (angina), hea failure, and esophageal spasms. It can be used both to treat and to prevent hea related chest pain, however is generally less preferred than beta blockers or calcium channel blockers. It is taken by mouth Isosorbide mononitrate is a nitrate-class drug used for the prevention of angina pectoris. Refer kDT 6/e p 525