You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name ethyl 4-[[(Z)-3-(3-butoxypropylamino)-2-cyano-3-oxoprop-1-enyl]amino]piperidine-1-carboxylate into its molecular formula.
user
C19H32N4O4
assistant