You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (5R)-5-methyl-N-[(1S)-1,2,3,4-tetrahydronaphthalen-1-yl]-4,5,6,7-tetrahydro-1-benzothiophene-2-carboxamide into its molecular formula.
user
C20H23NOS
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