You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (2S)-2-[(6-chloro-1,3-benzoxazol-2-yl)sulfanyl]-N-(4-morpholin-4-ylphenyl)propanamide into molecular formula.
user
C20H20ClN3O3S
assistant