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 methyl (2S)-2-[3-[(1Z,2S,4aS,5S,8aR)-7-iodo-2,5,8a-trimethyl-6-oxo-1-(2-oxopropylidene)-3,4,4a,5-tetrahydronaphthalen-2-yl]-3-methylbutyl]-2,5,5-trimethyloctanoate .
user
C33H53IO4
assistant