You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4-methoxyphenyl)methyl (6S,7S)-3-(1-acetyloxyethyl)-7-methoxy-8-oxo-7-[(2-thiophen-2-ylacetyl)amino]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H28N2O8S2
assistant