You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule N-hydroxy-2-oxo-4-[(4-pyrrol-1-ylphenyl)methyl]-3,5-dihydro-1H-1,4-benzodiazepine-7-carboxamide ?
user
C21H20N4O3
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