You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 3,4-dihydro-2H-quinolin-1-yl-[1-[6-(1,2,4-triazol-1-yl)pyridazin-3-yl]piperidin-3-yl]methanone .
user
C21H23N7O
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