You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-[4-[(4-aminocyclohexyl)amino]-6-[(5-cyanopyrazin-2-yl)amino]pyridazin-3-yl]acetamide by IUPAC nomenclature, provide its molecular formula.
user
C17H21N9O
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