You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by tert-butyl N-[3,5-dichloro-4-(6-chloro-5-propan-2-ylpyridazin-3-yl)oxyphenyl]-N-[(5-oxo-4H-1,2,4-oxadiazol-3-yl)methyl]carbamate ?
user
C21H22Cl3N5O5
assistant