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 6-[[9-fluoro-5-(2-fluorophenyl)-2-methyl-1,3,4,5-tetrahydro-2-benzazepin-8-yl]oxy]pyridazin-3-amine ?
user
C21H20F2N4O
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