You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-[1-(4-bromobenzoyl)piperidin-4-yl]-4-ethyl-2-(2-methoxyethyl)-1,2,4-triazol-3-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H25BrN4O3
assistant