You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-N-[5-[[(2S)-2,6-dimethyl-2,3-dihydroindol-1-yl]sulfonyl]-1,3,4-thiadiazol-2-yl]-2-phenoxypropanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H22N4O4S2
assistant