You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-2-amino-N-[(E,3S)-1-phenyl-6-[1,3-thiazol-2-yl-(2,2,2-trifluoroacetyl)amino]hex-4-en-3-yl]propanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H23F3N4O2S
assistant