You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as N-[(Z)-(2-nitrophenyl)methylideneamino]-6,7,8,9-tetrahydro-5H-carbazole-3-carboxamide using the IUPAC nomenclature.
user
C20H18N4O3
assistant