You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(2-chloro-4-nitrophenyl)-2-(2,4-dioxo-7-thia-1,3-diazaspiro[4.4]nonan-3-yl)acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C14H13ClN4O5S
assistant