You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule [(2R,3S,5R)-3-[bis(4-methoxyphenyl)-phenylmethoxy]-5-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolan-2-yl]methoxy-oxido-oxophosphanium into molecular formula.
user
C31H31N2O9P
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