You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named tert-butyl (7R)-3-(acetyloxymethyl)-7-fluoro-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate by IUPAC nomenclature, provide its molecular formula.
user
C14H18FNO5S
assistant