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 4-[3-[(2R)-1-methoxypropan-2-yl]imidazo[4,5-b]pyridin-2-yl]-1-pyrrolidin-1-ylbutan-1-one is given. What is its corresponding molecular formula?
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C18H26N4O2
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