You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-oxo-2-(2-propan-2-ylanilino)ethyl] (3R,7aS)-7a-methyl-5-oxo-2,3,6,7-tetrahydropyrrolo[2,1-b][1,3]thiazole-3-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H24N2O4S
assistant