You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[4-[5-[(dimethylamino)methyl]-4-methyl-1,2,4-triazol-3-yl]piperidin-1-yl]-(5-methoxy-1H-indol-2-yl)methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H28N6O2
assistant