You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 1-[3-[[[N-methyl-C-(2-oxa-7-azaspiro[4.4]nonan-7-yl)carbonimidoyl]amino]methyl]pyridin-2-yl]piperidine-4-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C21H32N6O2
assistant