You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S,3S,6S)-3-(1,3-benzodioxol-5-yl)-5-[(1-methylimidazol-2-yl)methyl]-1,5-diazatricyclo[5.2.2.02,6]undecane The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H26N4O2
assistant