You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[1,3-bis[2,6-di(propan-2-yl)phenyl]imidazolidin-2-ylidene]methyl-dichlorosilane is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H40Cl2N2Si
assistant