2,4,5,6-Tetraaminopyrimidine sulphate, also known as TAP.
 
This substance is commonly used as a building block in the synthesis of various organic compounds.
 
However, caution must be exercised when handling TAP, as it is classified as a hazardous material under several codes including H315, H319, H335 and more. The Material Safety Data Sheets (MSDS) for TAP provides detailed information on its hazards, such as its potential to cause skin irritation, eye irritation, and respiratory tract irritation.
 
TAP appears as a white to off-white crystalline powder.