You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 2-[1-[2-(2-chlorophenyl)ethyl]imidazol-4-yl]-4-(triazolidin-4-yl)pyridine is given. What is its corresponding molecular formula?
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C18H19ClN6
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