You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule [(1S,2R,7R,8aR)-1,8a-dimethyl-6-oxo-7-prop-1-en-2-yl-1,2,3,4,7,8-hexahydronaphthalen-2-yl] 3-methylbut-2-enoate ?
user
C20H28O3
assistant