You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
7-[4-[2-(chloroamino)acetyl]piperazin-1-yl]-6-fluoro-1-methyl-4-oxo-1H-[1,3]thiazeto[3,2-a]quinoline-3-carboxylic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H18ClFN4O4S
assistant