You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-cyclopropyl-7-(2,5-diazabicyclo[2.2.1]heptan-2-yl)-6,8-difluoro-4-oxo-4a,5-dihydroquinoline-3-carboxylic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H19F2N3O3
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