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 4-(2-hydroxyethyl)-13-methoxy-2-methyl-4,7,17-triazatetracyclo[8.7.0.02,7.011,16]heptadeca-1(10),11(16),12,14-tetraene-3,6-dione into molecular formula.
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C18H21N3O4
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