You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
7-[4-(2,4-dimethylbenzoyl)piperazin-1-yl]sulfonyl-2,6-dimethyl-4H-1,4-benzoxazin-3-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H27N3O5S
assistant