You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[2-methylpropyl-(2-phenylmethoxyacetyl)amino]-N-(4-methyl-1,3-thiazol-2-yl)acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H25N3O3S
assistant