You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-chloro-2-ethoxy-3,3-difluoro-1-oxa-2lambda5-phosphaspiro[5.5]undec-4-ene 2-oxide is the IUPAC name of a molecule. Please give its molecular formula.
user
C11H16ClF2O3P
assistant