You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 1-methyl-4-[[(3S)-3-(4-propan-2-yl-1,3-thiazol-2-yl)piperidin-1-yl]methyl]pyridin-2-one is given. What is its corresponding molecular formula?
user
C18H25N3OS
assistant