Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 76-54-0, Whether you call it 2',7'-Dichlorofluorescein or 2 -7-Dichloro-3 -6-dihydroxyspiro[isobenzofuran-1(3H) -9-[9H]xanthen]-3-one you can be assured the products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.