You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(4-methylpiperidin-1-yl)-2-(4-methyl-2-pyridin-3-yl-1,3-thiazol-5-yl)ethanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C17H21N3OS
assistant