You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(4aR,8aR)-1,2,3,4,4a,5,6,7,8,8a-decahydro-2,7-naphthyridin-4-yl]methanol is the IUPAC name of a molecule. Please give its molecular formula.
user
C9H18N2O
assistant