You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-[(5-methyl-1,2-oxazol-3-yl)amino]-2-oxo-1-phenylethyl] 2-(2-chlorophenyl)sulfanylacetate is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H17ClN2O4S
assistant