You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-methyl-4-[6-(4-pyridin-2-ylpiperazin-1-yl)pyridin-3-yl]sulfonylpiperazine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H26N6O2S
assistant