You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[[(1R,2S,4S)-2-bicyclo[2.2.1]hept-5-enyl]methyl]-4-[(4-methylsulfanylphenyl)methyl]piperazine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H28N2S
assistant