You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 4-(3-bromophenyl)-3-(4-fluorophenyl)-5-(3-methoxypropyl)-1,4-dihydropyrrolo[3,4-c]pyrazol-6-one .
user
C21H19BrFN3O2
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