You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethoxy-[2-methoxy-2-[(2S,5R)-5-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolan-2-yl]ethenyl]-oxophosphanium is the IUPAC name of a molecule. Please give its molecular formula.
user
C14H20N2O6P+
assistant