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 2-[4-methyl-6-[[(3R)-1-methylpiperidin-3-yl]amino]pyridazin-3-yl]-5-(trifluoromethoxy)phenol ?
user
C18H21F3N4O2
assistant