You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(4-butan-2-ylphenyl)-2-[1-(4-ethylphenyl)-1-oxopropan-2-yl]sulfanylquinazolin-4-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C29H30N2O2S
assistant