You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[1-[2-(2-methyl-2,3-dihydroindol-1-yl)-2-oxoethyl]triazol-4-yl]propanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H19N5O2
assistant