1,1'-(2,5-Thiophenediylbis(dimethylsilylene))silatrane 2,8,9-Trioxa-5-aza-1-silabicyclo(3.3.3)undecane, 1,1'-(2,5-thiophenediylbis((dimethylsilylene)-2,1-ethanediyl))bis- 72517-67-0