You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-(5-methyl-1,3,4-oxadiazol-2-yl)-1,6-naphthyridin-7-yl]-1-(2-methylpropyl)piperidine-4-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H26N6O2
assistant