You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2,2-dimethylpropyl 2-[2-(ethylcarbamoylamino)-7-[4-[(1-methylpiperazin-2-yl)amino]-4-oxobutoxy]-4H-quinazolin-3-yl]acetate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C27H43N7O5
assistant