You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
7-chloro-6-oxabicyclo[3.1.1]hepta-1(7),2,4-triene;[hydroxy-(2-nitrophenyl)methyl]phosphonic acid is the IUPAC name of a molecule. Please give its molecular formula.
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C13H11ClNO7P
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