You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2,3-dimethyl-13,14-dimethylidene-10,12-dioxa-1,3-diazaspiro[4.9]tetradec-1-en-4-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C14H20N2O3
assistant