You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(5S)-N-(2-amino-2-oxoethyl)-N,5-dimethyl-4,5,6,7-tetrahydro-1-benzothiophene-2-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C13H18N2O2S
assistant