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 [(3R)-1-(7-bromo-5-cyclopropyl-6-methyl-4-oxo-[1,3]oxazolo[4,5-c]quinolin-2-yl)pyrrolidin-3-yl]methylcarbamic acid .
user
C20H21BrN4O4
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