You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[5-(4-chlorophenyl)furan-2-yl]methyl-methylamino]-N-[(2S)-2-cyano-3-methylbutan-2-yl]acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H24ClN3O2
assistant