12,14-Dioxa-13-thia-1,4,6,8,11-pentaaza-2,3,5,7,9,10-hexasiladispiro[4.1.4.3]tetradecane, 1,2,2,3,3,4,6,8,9,9,10,10,11-tridecamethyl-,13,13-dioxide