Greiss reagent is not a single chemical compound, but rather a solution used for detecting nitrites.

Here's the breakdown:

* Primary component: Sulfanilamide (C₆H₈N₂O₂S)

* Secondary component: N-(1-Naphthyl)ethylenediamine dihydrochloride (C₁₂H₁₆N₂·2HCl)

These two components are dissolved in separate solutions, typically acidic, and then mixed together to form the actual reagent.

Important Note: The specific proportions and acidity of the solutions can vary depending on the application.

Let me know if you need more information about the reaction mechanism of Greiss reagent or its applications!