Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 1143-38-0, Whether you call it Anthralin, 1 -8 -9-Anthracenetriol , Anthralin , 1 -8-Dihydroxyanthrone or Dithranol you can be assured the Anthralin products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.