You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-(cyclopentanecarbonyl)phenyl]-N'-(5-methylsulfanyl-1,3-thiazol-2-yl)propanediamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H21N3O3S2
assistant