You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N,N-dibutyl-2-[6-chloro-2-(4-methylphenyl)imidazo[1,2-b]pyridazin-3-yl]acetamide by IUPAC nomenclature, provide its molecular formula.
user
C23H29ClN4O
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