You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 4-cyclohexa-1,3-dien-1-yl-2-N-methyl-2-N-(1-phenylethenyl)cyclohexa-1,3-diene-1,2-diamine .
user
C21H24N2
assistant