You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 3-(1a,2,3,7b-tetrahydro-1H-cyclopropa[a]naphthalen-1-yl)-4-ethyl-1H-1,2,4-triazole-5-thione into molecular formula.
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C15H17N3S
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