You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[[4-(2-methoxyphenyl)piperazin-1-yl]methyl]-4,4-diphenylpyrrolidin-2-one;dihydrochloride The above is the IUPAC name of a molecule. Write its molecular formula.
user
C28H33Cl2N3O2
assistant