You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1R)-N-benzyl-8-(2-methylpropyl)-3,4,5,6,9-pentazatricyclo[7.3.0.02,6]dodeca-2,4-dien-7-imine is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H24N6
assistant