You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-(11-piperidin-2-yl-1,8,12-triazatricyclo[7.3.0.03,7]dodeca-2,7,9,11-tetraen-2-yl)morpholine is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H25N5O
assistant