Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 65-28-1, Whether you call it Phentolamine Methanesulfonate Salt, 3-[N-(2-Imidazolin-2-ylmethyl)-p-toluidino]phenol Methanesulfonate or Phentolamine Methanesulfonate Salt you can be assured the Phentolamine Methanesulfonate Salt products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.