Used as a key intermediate in the synthesis of pharmaceuticals, particularly in the development of antiviral and anticancer agents. Its reactivity allows for the introduction of pyrimidine moieties into larger molecules, enhancing target specificity and biological activity. Commonly employed in the preparation of nucleoside analogs and kinase inhibitors. Also utilized in agrochemicals for the creation of novel pesticides and herbicides due to its ability to modulate biological pathways in pests and weeds. Its role as an acylating agent makes it valuable in organic synthesis for constructing complex heterocyclic systems.