You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (1S,3R,6S,7R)-4-(3,5-dinitrobenzoyl)-6,7-dimethyl-4-azatricyclo[4.3.0.03,7]nonane-3-carbonitrile .
user
C18H18N4O5
assistant