You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named furan-2-yl-[(3R)-3-(6,7,8,9-tetrahydro-5H-pyrimido[4,5-d]azepin-4-ylamino)piperidin-1-yl]methanone is given. What is its corresponding molecular formula?
user
C18H23N5O2
assistant