You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4-nitrophenyl)methyl (5S)-3-methyl-7-oxo-6-oxa-4-thia-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C13H10N2O6S
assistant