You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[4-[[oxolan-2-ylmethyl-[[2-(trifluoromethyl)phenyl]carbamoyl]amino]methyl]phenyl] methanesulfonate is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H23F3N2O5S
assistant