Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 759-73-9, Whether you call it N-Nitroso-N-ethylurea, ENU or N-Ethyl-N-nitrosourea you can be assured the N-Nitroso-N-ethylurea products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.