You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2,3-dichloro-N-[3-[[4-(oxan-3-yloxymethyl)phenyl]methoxy]pyrazin-2-yl]benzenesulfonamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H23Cl2N3O5S
assistant