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 (3R,5S)-3-(2-cyclopropyl-1-methyl-6,7-dihydro-4H-imidazo[4,5-c]pyridin-5-yl)-5-methyloxolan-2-one is given. What is its corresponding molecular formula?
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C15H21N3O2
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