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 2-[(4,5-dimethyl-1,3-oxazol-2-yl)methyl]-1-ethyl-3-[2-(7-ethyl-1H-indol-3-yl)ethyl]guanidine is given. What is its corresponding molecular formula?
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C21H29N5O
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