498555-82-1 4,7-Dioxa-3,8-disiladecane,2,2,3,3,8,8,9,9-octamethyl-5-(2-propenyl)-6-[(trimethylgermyl)ethynyl]-,(5R,6R)-rel- 65904-12-3 1,3,7,9-tetratert-butyl-2,2,8,8-tetramethyl-5,10-dithia-1,3,7,9-tetraza-2,8-disila-4,6-distannadispiro[3.1.36.14]decane