You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-2-(5-methyl-2-propan-2-ylphenoxy)-N-(5-phenyl-1,3,4-thiadiazol-2-yl)propanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H23N3O2S
assistant