Nitro blue tetrazolium A.R. (NBT) is a chemical compound with a CAS number of 298-83-9 and a molecular weight of 319.21 g/mol.
 
This product is commonly used in laboratories as a substrate for the detection of enzymes such as dehydrogenases, oxidases, and peroxidases.
 
However, it is important to note that NBT is classified as a hazardous substance and must be handled with care. GHS hazard warning codes for this product include H302 (harmful if swallowed), H315 (causes skin irritation), H319 (causes serious eye irritation), and H335 (may cause respiratory irritation). Please consult the product's safety data sheet (SDS) for more detailed information on handling and storage.