You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by (8aS)-5,6-dimethyl-4-(2-methylpropyl)-3,4,4a,5,6,7,8,8a-octahydro-1H-naphthalen-2-one;hydrate ?
user
C16H30O2
assistant