You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 3-[[4-[2-[[4-(3-bromoanilino)-7-ethoxyquinazolin-6-yl]amino]-2-oxoethyl]-5-sulfanylidene-1,3,4-thiadiazol-2-yl]sulfanyl]propanoic acid .
user
C23H21BrN6O4S3
assistant