You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (NZ)-N-[[8-chloro-6-(2-fluorophenyl)-1-methyl-4H-imidazo[1,5-a][1,4]benzodiazepin-3-yl]methylidene]hydroxylamine by IUPAC nomenclature, provide its molecular formula.
user
C19H14ClFN4O
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