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 5-ethyl-5-[[(5-ethyl-2-methyl-2-oxo-1,3,2lambda5-dioxaphosphinan-5-yl)methoxy-methylphosphoryl]oxymethyl]-2-methyl-1,3,2lambda5-dioxaphosphinane 2-oxide .
user
C15H31O9P3
assistant