You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as N-(2-ethylsulfonylethyl)-2,3,3a,4,5,6,7,7a-octahydro-1H-indole-2-carboxamide;hydrochloride using the IUPAC nomenclature.
user
C13H25ClN2O3S
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