You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 3-[4-[4-(5-oxo-1-propan-2-yl-1,2,4-triazolidin-4-yl)phenyl]piperazin-1-yl]-2-phenylpropanoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H35N5O3
assistant