You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 8-amino-7-fluoro-2-methyl-6-(4-methylpiperazin-1-yl)-10-oxo-4-oxa-1-azatricyclo[7.3.1.05,13]trideca-2,5(13),6,8,11-pentaene-11-carboxylic acid is given. What is its corresponding molecular formula?
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C18H19FN4O4
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