You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as N-[(3-chloro-4-ethoxy-5-methoxyphenyl)methyl]-1-[(2-chlorophenyl)methyl]pyrazole-4-carboxamide using the IUPAC nomenclature.
user
C21H21Cl2N3O3
assistant