You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 1-(4-cyclobutylpiperazin-1-yl)-2-(5,8,10-triazatricyclo[7.4.0.02,7]trideca-1(9),2(7),10,12-tetraen-5-yl)ethanone into molecular formula.
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C20H27N5O
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