You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2,2,4,4,6,6-hexamethyl-8,8-diphenyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H28O4Si4
assistant