You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(2-methyl-5-nitrophenyl)-3-[4-([1,2,4]triazolo[4,3-a]pyridin-3-yl)piperidin-1-yl]propanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H24N6O3
assistant