Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 63-42-3, Whether you call it Lactose, Anhydrous, 4-O-Beta-Galactopyranosyl-D-glucose , Milk Sugar or Anhydrous Lactose you can be assured the Lactose, Anhydrous products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.