You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-[(1S)-1-(1-benzofuran-2-yl)ethyl]-N-methyl-[1,2,4]triazolo[4,3-a]pyridine-6-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C18H16N4O2
assistant