You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[4-[hydroxy(thiophen-2-yl)methyl]piperidin-1-yl]-2-(2-methylimidazol-1-yl)ethanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H21N3O2S
assistant