You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[[(1-oxo-2,6,7-trioxa-1lambda5-phosphabicyclo[2.2.2]octan-4-yl)methoxy-phenylphosphoryl]oxymethyl]-2,6,7-trioxa-1lambda5-phosphabicyclo[2.2.2]octane 1-oxide is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H21O11P3
assistant