You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-tert-butyl-4-[2-(2-oxo-1,3-dihydroindol-5-yl)acetyl]piperazine-1-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H26N4O3
assistant