You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[3-(2,3,4,5,6,7,8-heptadeuterionaphthalen-1-yl)phenyl]-N-[4-(4-phenylphenyl)phenyl]naphthalen-1-amine is the IUPAC name of a molecule. Please give its molecular formula.
user
C44H31N
assistant