You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 7-(2,4-difluorophenyl)-8-(2-hydroxyethylsulfanyl)-6-(trifluoromethyl)-1H-quinazoline-2,4-dione;ethane ?
user
C21H23F5N2O3S
assistant