You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(6R)-4-acetamido-3-(acetyloxymethyl)-2-benzyl-7-(4-nitrophenyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-3-ene-2-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C25H22N3O8S-
assistant