InChI=1S/C21H35NO4Si2/c1-8-18(22-15-9-10-19(22)23)20(25-27(2,3)4)16-11-13-17(14-12-16)21(24)26-28(5,6)7/h11-14,18,20H,8-10,15H2,1-7H3