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 N-butan-2-yl-N-[2-[4-[6-(2-chlorophenyl)pyridazin-3-yl]piperazin-1-yl]-2-oxoethyl]-3-methoxybenzamide ?
user
C28H32ClN5O3
assistant