You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(4-fluorocyclohexyl)spiro[3a,4,4a,6,7,8,9,9a,10,10a-decahydro-[1]benzofuro[6,5-b]azepine-5,1'-cyclopropane]-3-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H31FN2O2
assistant