You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule 2-[1-[(3,5-dichloropyridin-4-yl)methyl]-6-methoxyphthalazin-5-yl]-N-ethenylethanimine;yttrium into molecular formula.
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C19H14Cl2N4OY-2
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