You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(piperidin-2-ylmethylsulfonyl)-2,3,4,4a,5,6,7,7a-octahydrocyclopenta[b]pyridine is the IUPAC name of a molecule. Please give its molecular formula.
user
C14H26N2O2S
assistant