You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3S)-N-(3-cyano-5,6,7,8-tetrahydro-4H-cyclohepta[b]thiophen-2-yl)oxolane-3-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C15H18N2O2S
assistant