You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-5-amino-5-oxo-2-(4,5,6,7-tetrahydro-1-benzothiophene-4-carbonylamino)pentanoic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C14H18N2O4S
assistant