Tetrachloroethylene is not a nitrate.
C2Cl4
The International Agency for Research on Cancer has classified tetrachloroethylene as a Group 2A carcinogen, which means that it is probably carcinogenic to humans. Tetrachloroethylene dissolves fats from the skin, potentially resulting in skin irritation. Animal studies and a study of 99 twins by Dr. Samuel Goldman and researchers at the Parkinson's Institute in Sunnyvale, California determined there is a "lot of circumstantial evidence" that exposure to Tetrachloroethlene increases the risk of developing Parkinson's disease ninefold.
Organic, aromatic hydrocarbon compound: CH3-C6H5
The substrate for nitrate reductase is nitrate (NO3-). Nitrate reductase catalyzes the reduction of nitrate to nitrite (NO2-) during the process of nitrate assimilation in plants and microorganisms.
Tetrachloroethylene, also known as perchloroethylene, is commonly found in dry-cleaning solutions, degreasing agents, and some spot removers. It is also used in manufacturing processes for textiles, metals, and rubber.
KNO3 is the chemical formula of potassium nitrate.
Potassium nitrate is KNO3. There is one potassium per one nitrate. One mole of potassium nitrate contains one mole of nitrate.
The symbol for nitrate is NO3-. The valency of nitrate is -1.
Nitrate: NO3-
amyl nitrate
For example in nitrates as: sodium nitrate, potassium nitrate, uranyl nitrate, ammonium nitrate, etc.
You can try looking for it using its newer name, tetrachloroethylene. Many different online chemical suppliers carry it under that name. Also, several automotive cleaning products use tetrachloroethylene as their primary ingredient, but there are probably other solvents mixed in, so they may not work for your purposes. I'll give a couple of examples. At an auto parts store (or the automotive section of Wal-Mart), look for spray cans of "Electrical Contact Cleaner", and read the fine print on a can to make sure it uses tetrachloroethylene. You can also look for spray cans of "Brake Parts Cleaner", but many of those just use a blend of petroleum-based solvents. If the can says "non-chlorinated", it's the wrong stuff. If it DOESN'T say "non-chlorinated", read the fine print and look for tetrachloroethylene.