You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[5-[9-[3-[7-(4-ethylpiperazin-1-yl)-2-methyl-5-phenylpyrazolo[1,5-a]pyrimidin-3-yl]phenyl]nonylamino]-2-methyl-4-oxoquinazolin-3-yl]piperidine-2,6-dione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C48H57N9O3
assistant