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 tert-butyl N-[(2S)-3-hydroxy-2-(2-propylimidazo[4,5-c]quinolin-1-yl)propyl]carbamate is given. What is its corresponding molecular formula?
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C21H28N4O3
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