You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named (2S,3aS,7aS)-1-(4-chloro-1,3-thiazole-5-carbonyl)-2,3,3a,4,5,6,7,7a-octahydroindole-2-carboxylic acid by IUPAC nomenclature, provide its molecular formula.
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C13H15ClN2O3S
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