5-Aza-(3’,5’-Di-O-p-toluoyl)-2’-deoxyuridine (β Isomer) is an intermediate used in the synthesis of 5-Aza-2’-deoxyuridine (α/β mixture) (A797120), which is a metabolite of 5-aza-2’-deoxycytidine (A796950),a cancer treatment, in particular to inhibit the growth of pancreatic endocrine tumor cell lines.