You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-chloro-2-ethyl-2-naphthalen-1-ylazulen-4-ide;dichloro(dimethylsilylidene)hafnium The above is the IUPAC name of a molecule. Write its molecular formula.
user
C46H42Cl4HfSi-2
assistant