You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-2-[[(Z)-4-oxo-1-phenyl-4-piperidin-1-ylbut-2-en-2-yl]amino]-2-phenylacetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H27N3O2
assistant