You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-ethyl-1-(6,7,8,9-tetrahydro-5H-cyclohepta[d]pyrimidin-4-yl)azetidin-3-ol The above is the IUPAC name of a molecule. Write its molecular formula.
user
C14H21N3O
assistant