You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance (4-nitrophenyl)methyl (5R,6E)-7-oxo-6-(thiophen-2-ylmethylidene)-4-thia-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate .
user
C18H12N2O5S2
assistant