2,?2,?3,?3,?9,?9,?10,?10-?Octamethyl-?6-?(2-?ethan-1-al)?-4,?8-?dioxa-?3,?9-?disilaundecane is an intermediate used in the synthesis of 6,6''-Dihydroxypregabalin Lactam (D454645), which is an impurity of rac-Pregabalin (P704800), a GABA analogue used as an anti-convulsant.Controlled substance in the United States.Not controlled in Germany