You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-(6-methoxypyrimidin-4-yl)-2-[6-[(3R)-3-[(3-methyloxetan-3-yl)amino]pyrrolidin-1-yl]pyridazin-3-yl]phenol The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H26N6O3
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