You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named (5R)-N-[[(2S)-oxolan-2-yl]methyl]-7-(1,3-thiazole-4-carbonyl)-1-oxa-2,7-diazaspiro[4.4]non-2-ene-3-carboxamide by IUPAC nomenclature, provide its molecular formula.
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C16H20N4O4S
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