You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by phosphonooxymethyl 3-[7-[4-(2,5-dioxopyrrolidin-1-yl)oxy-4-oxobutyl]-2-oxochromen-3-yl]butanoate ?
user
C22H24NO12P
assistant