You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-(2,5-dichloroanilino)-2-oxoethyl]-5-methyl-3-phenyl-N-propyl-1,2-oxazole-4-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H21Cl2N3O3
assistant