2,5-Bis(dimethyl(3-piperidinopropyl)silyl)thiophene dihydrochloride 66443-72-9 Si,Si'-(2,5-Thiendiyl)bis(dimethyl(3-piperidinopropyl)silane) dihydrochloride Silane, Si,Si'-(2,5-thienediyl)bis(dimethyl(3-piperidinopropyl)-, dihydrochloride