You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
7-[(3R)-3-(1-aminoethyl)pyrrolidin-1-yl]-1-cyclopropyl-6-fluoro-4-oxo-1,8-naphthyridine-3-carboxylic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H21FN4O3
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