You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5,6-dihydro-4H-pyrrolo[1,2-b]pyrazol-3-yl-[4-[[3-(4-methylpyridin-2-yl)-1,2,4-oxadiazol-5-yl]methyl]piperidin-1-yl]methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H24N6O2
assistant