You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 5-(2,3,3a,4,5,6,7,7a-octahydro-1H-indol-2-yl)-3-(thiolan-2-yl)-1,2,4-oxadiazole by IUPAC nomenclature, provide its molecular formula.
user
C14H21N3OS
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