You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance (1R,6S,7R,9S)-9-(2,4-dimethoxyphenyl)-12-imino-10,11-dioxatricyclo[5.3.2.01,6]dodecane-7,8,8-tricarbonitrile .
user
C21H20N4O4
assistant