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 4-chloro-5-[4-(difluoromethoxy)-6-(4,4,4-trifluorobutan-2-ylamino)pyridin-3-yl]-1-ethylpyrazole-3-carboxylate ?
user
C18H20ClF5N4O3
assistant