You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (4-nitrophenyl)methyl (4Z,6R)-3-(acetyloxymethyl)-4-(chloromethylidene)-8-oxo-7-[(2-phenoxyacetyl)amino]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate .
user
C26H22ClN3O9S
assistant