You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1-methyl-1,2,4-triazol-3-yl) N-[3-bromo-1-[(3-chloro-4-fluorophenyl)carbamoyl]-2-methyl-5,6-dihydro-4H-cyclopenta[c]pyrrol-4-yl]-N-methylcarbamate is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H19BrClFN6O3
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