You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
12,14-dibutyl-6-chloro-2,8,16-triazatetracyclo[7.7.0.02,7.010,15]hexadeca-1(9),3,5,7,10,12,14-heptaene is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H24ClN3
assistant