You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
dimethyl 4-bromo-3-[[(7R)-1,4-dioxa-8-azaspiro[4.5]decan-7-yl]methoxy]benzene-1,2-dicarboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H22BrNO7
assistant