You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4,22-dimethyl-4,21,22,23-tetrazapentacyclo[16.2.1.13,6.18,11.113,16]tetracosa-1,3(24),5,7,9,11(23),12,14,16,18(21),19-undecaene is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H18N4
assistant