You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule ethyl 5-[2-[1-(4-methoxyphenyl)imidazol-2-yl]sulfanylacetyl]-2,4-dimethyl-1H-pyrrole-3-carboxylate ?
user
C21H23N3O4S
assistant