Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 5796-17-8, Whether you call it D-3,4-Dihydroxyphenylalanine, D-DOPA , 3-(3 -4-Dihydroxyphenyl)-D-alanine or D-3-Hydroxytyrosine you can be assured the D-3,4-Dihydroxyphenylalanine products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.