You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(1S)-1-[4-(4-bromophenyl)sulfonylpiperazin-1-yl]ethyl]-4-cyclohexyloxyquinazoline is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H31BrN4O3S
assistant