630389-81-0 1,15,18-Trioxa-4,6,10,12-tetraazacycloeicosane-5,11-dithione,8,8'-[[5-(1,1-dimethylethyl)-1,3-phenylene]bis(methylene)]bis- 496854-19-4 1,11-Dioxa-2,10,12,20-tetrasila-4,8,14,18-tetrastannacycloeicosane,4,4,8,8,14,14,18,18-octachloro-2,2,10,10,12,12,20,20-octamethyl-