You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(1,2,3,4,4a,5,6,7,8,8a-decahydronaphthalen-2-yl)-2-pyridin-2-ylethanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C17H23NO
assistant