Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 91-64-5, Whether you call it Coumarin, 2H-1-Benzopyran-2-one , 1 -2-Benzopyrone , 5 -6-Benzo-2-pyrone , Cumarin or Tonka Bean Camphor you can be assured the Coumarin products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.