You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[4-(5-ethylpyrimidin-2-yl)piperazin-1-yl]-[2-[(3-phenyl-4H-quinazolin-4-yl)amino]phenyl]methanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C31H31N7O
assistant