2-((tert-Butyldimethylsilyl)oxy)ethyl 2,2,2-trichloroacetimidate is an intermediate in the synthesis of 28-Ethylhydroxy Rapamycin (E678640), which is an impurity of Everolimus (E945400),a derivative of Rapamycin. Everolimus inhibits cytokine-mediated lymphocyte proliferation.