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 (5R,6S)-3-(acetyloxymethyl)-6-[(1R)-1-[(4-nitrophenyl)methoxycarbonyloxy]ethyl]-7-oxo-4-thia-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate .
user
C26H23N3O12S
assistant