You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(2,5-dichlorophenyl)-N-[(3,5-dimethyl-1,2-oxazol-4-yl)methyl]-N-methyl-2-oxopyrrolidine-3-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H19Cl2N3O3
assistant