You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-[4-(dimethylamino)anilino]-2-oxoethyl] 1-butyl-5-chloro-3-methylpyrazole-4-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H25ClN4O3
assistant