You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3,15-dioxa-10-azatetracyclo[8.7.0.01,13.04,9]heptadeca-4,6,8,13-tetraen-16-yl acetate is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H17NO4
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