You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule [(1R,2S,4R,5S)-4-[(1R)-1-methoxybut-3-enyl]-9-oxo-2-bicyclo[3.3.1]nonanyl]methyl 2,2-dimethylpropanoate .
user
C20H32O4
assistant