You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 2-(5-acetylthiophen-3-yl)-1-[(1R,5S)-3-hydroxy-9-azabicyclo[3.3.1]nonan-9-yl]ethanone ?
user
C16H21NO3S
assistant