You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(3,4-dichlorophenyl)methyl]-3-[[(2S)-4-sulfanylpyrrolidin-2-yl]methylamino]benzamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H21Cl2N3OS
assistant