You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(6aS,7S)-2-(4-chlorophenyl)-6,11-dioxo-6a,7,8,9-tetrahydro-5H-pyrrolo[2,1-c][1,4]benzodiazepin-7-yl]-1-methylpyrrole-2-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C24H21ClN4O3
assistant