You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(3,5-dimethyl-1,2-oxazol-4-yl)-1-[4-hydroxy-4-(pyridin-4-ylmethyl)piperidin-1-yl]ethanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H23N3O3
assistant