You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[3-[[[C-(6-azaspiro[3.4]octan-6-yl)-N-methylcarbonimidoyl]amino]methyl]phenyl]furan-2-carboxamide;hydroiodide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H27IN4O2
assistant