You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[4-[[(2S)-2-hydroxy-3-(4-methoxyphenyl)-2-methylpropyl]sulfamoyl]phenyl]-2-methylpropanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H28N2O5S
assistant