Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 85-18-7, Whether you call it 8-Chlorotheophylline or 8-Chloro-1 -3-dimethyl-2 -6(1H -3H)-purinedione you can be assured the products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.