You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(azepan-1-yl)-2-[4-(5-piperidin-1-ylsulfonylpyridin-2-yl)piperazin-1-yl]ethanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H35N5O3S
assistant