The invention relates to a microwave tube comprising an electron gun generating an electron beam in a cylindrical microwave structure of the tube. Pharmaceutical compositions comprising a compound of Formula I and methods of treating conditions such as hypertension, congestive heart failure, cardiac insufficiency, coronary vasospasm, cardiac ischemia, liver cirrhosis, renal vasospasm, renal failure, cerebral edema and ischemia, stroke, thrombosis, or water retention are also disclosed. Once the catalyst is fully spent in the final reactor the catalyst can be oxidatively regenerated. An obtaining processing unit accesses the first storage unit to obtain the optimal original image pair.