You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-methyl-4-phenyl-1H-inden-1-ide;[methyl(phenyl)silylidene]hafnium(2+);dichloride The above is the IUPAC name of a molecule. Write its molecular formula.
user
C78H68Cl2Hf2Si2-2
assistant