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-[1-[3-(propan-2-ylamino)propyl]-1,3,4,9-tetrahydropyrido[3,4-b]indol-2-yl]ethanone into molecular formula.
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C19H27N3O
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