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-1-yl)-6-(1,2,3,4,4a,5,6,7,8,8a-decahydronaphthalen-2-yl)hexane-1,6-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H42O2
assistant