You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-benzyl-11-phenyl-1,4,7,12,13-pentazatricyclo[8.3.0.02,6]trideca-10,12-diene;hypochlorous acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H24ClN5O
assistant